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UNITED STATES 

DEPARTMENT OF COMMERCE 

NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION 

NATIONAL MARINE FISHERIES SERVICE 

COMMERCIAL FISHERIES RESEARCH AND DEVELOPMENT ACT 



ANNUAL REPORT 



State: Massachusetts 

Sub-Project No. : 3-287-R-U 

Project Title: Coastwide Fishery Resource Assessment 

Sub-Project Title: Fishery Resource Assessment, Coastal Massachusetts 

Period covered: January 21, 1981 - January 20, 1982 

Prepared by: Arnold B. Howe, Senior Marine Fisheries Biologist Date: 

Thomas P. Currier, Marine Fisheries Biologist 
Sherry L. Sass, Assistant Marine Fisheries Biologist 
Brian C. Kelly, Assistant Marine Fisheries Biologist 

Approved by: ,-^>>' */.'■■■ > ■-• / J- -i- ■ *'-■ Assistant Director Date: 










W&2m*** 



PUBLICATION: #13640-97- 40-6- 84-CR 
APPROVED BY Daniel Carter, State Purchasing Agent 



r' '- 



TABLE OF CONTENTS 



Page 
Number 

FIGURE AND TABLE LIST, Job 1 

ABSTRACT 

Job 1: Fishery Resource Assessment, Coastal Massachusetts 

INTRODUCTION 1 

FIELD AND ANALYTICAL PROCEDURES 1 

RESULTS AND DISCUSSION 2 

SPRING CRUISE #927 2 

AUTUMN CRUISE #928 ** 

ACKNOWLEDGEMENTS 6 

REFERENCES 7 

Job 2: Evaluation of winter flounder year-class success 

INTRODUCTION 8 

REVIEW 8 

METHODS 9 

Sampling techniques 9 

YOY index 9 

RESULTS AND DISCUSSION 10 

REFERENCES 11 



FIGURE AND TABLE LIST, JOB 1 



Sampling strata used in Massachusetts DMF inshore 
bottom trawl survey 

Allotment of sampling effort to Massachusetts, 
inshore strata, 1981 survey cruises 

Common and scientific names of species mentioned 

Summary of 1981 Massachusetts Division of Marine 
Fisheries bottom trawl survey cruise effort and 
collection, Massachusetts territorial waters . 



Figure 1 

Table 1 
Table 2 



Table 3 



Weight (kg) and number for species collected during 
the 1981 spring and autumn bottom trawl surveys, 
Massachusetts territorial waters 



Table 4 



Stratified mean catch per tow, 
estimates of precision and 
average weight per individual 
for all Massachusetts inshore 
strata, sets, spring and 
autumn, 1978-1981 



Stratified mean numbers 
per "tow tun trans formed) 
by length frequency 
intervals for regions 
1-5 » Massachusetts 
inshore bottom trawl 
survey, spring and 
autumn, 1981. 



All species 


Table 


5 


Atlantic cod 


Table 


6 


Haddock 


Table 


8 


Silver hake 


Table 


10 


Red hake 


Table 


12 


White hake 


Table 


14 


Scup 


Table 


16 


Black sea bass 


Table 


18 


Tautog 


Table 


20 


Ocean pout 


Table 


22 


Northern searobin 


Table 


24 


Longhorn sculpin 


Table 


26 


Yellowtail flounder 


Table 


28 


Winter flounder 


Table 


30 


Summer flounder 


Table 


32 


American plaice 


Table 


34 


Witch flounder 


Table 


36 


Windowpane 


Table 


38 


Atlantic herring 


Table 


40 


Butterfish 


Table 


42 



Table 7 
Table 9 
Table 11 
Table 13 
Table 15 
Table 17 
Table 19 
Table 21 
Table 23 
Table 25 
Table 27 
Table 29 
Table 31 
Table 33 
Table 35 
Table 37 
Table 39 
Table 41 
Table 43 



Sand lance Table 44 Table 45 

Spiny dogfish Table 46 Table 47 

Little skate Table 48 Table 49 

Winter skate Table 50 Table 51 

Longfin squid Table 52 Table 53 

American lobster Table 54 Table 55 

Rock crab Table 56 Table 57 

Average bottom temperature (°C) by depth interval and region, 
Massachusetts inshore bottom trawl surveys, spring and 
autumn, 1981 . , Table 58 



ABSTRACT 

In 1981, the Massachusetts Division of Marine Fisheries continued 
its standardized semiannual bottom trawl survey program to monitor 
relative abundance of fish stocks in state territorial waters. In 
three-week, daytime, spring and autumn cruises, 97 and 95 stations, 
respectively, were completed (sampling intensity of 1 station/20 sq n mi). 
Seasonal abundance and distribution of 26 predominant finfish and shell- 
fish species were described by comparing computer- generated relative 
abundance indices (stratified mean catch in kilograms and number per tow) 
to 1980 indices. For each species, indices of abundance are also pre- 
sented from all prior surveys. 

Despite similar cruise timing each year, the 1981 spring and autumn 
bottom water temperatures were the coldest and warmest, respectively, 
noted to date. These thermal conditions undoubtedly stimulated delays in 
seasonal movement of many groundfish and flounder stocks (i.e., spring/ 
offshore, autumn/ inshore) and possibly affected the production and/or 
distribution of offspring, most noticeably of non-endemic species. The 
spring cruise was as unusual for its abundance of biomass as the autumn 
cruise was for its comparative scarcity of all size fish, including 
young-of-the-year. In spring, 20 species, were at a higher level of 
biomass than in 1980; of these, nine were 100-300% higher; 15 were at 
record biomass levels and four others were at record number levels. 
When the fall cruise was compared to that of 1980, 19 species were less 
abundant in biomass; 17 species were lower in number. Ten species were 
at their lowest numerical level in the autumn survey timeseries. 

In addition to the uniqueness of seasonal catch levels, other 
notable phenomena included the strong spring occurrence of young-of-the- 
year Atlantic cod east and south of Cape Cod; two-year-old (1979 year 
class) summer flounder making an unusual and significant showing in both 
spring and autumn catches ; and a paradoxical autumn decrease in rock 
crab catch. 

To evaluate a systematic beach seining program for predicting winter 
flounder recruitment, seven years (1975-81) of sampling data from six 
estuaries on the south shore of Cape Cod were re-analyzed following post- 
stratification. An eighth sampling year (1982), with number of stations 
proportionately allocated by estuary, was similarly analyzed. Results 
indicated that changes in relative year-class strength seem to be reliably 
detected. 



Job 1: Fishery Resource Assessment, Coastal Massachusetts 



INTRODUCTION 

In 1978, the Massachusetts Division of Marine Fisheries (DMF) 
initiated a five-year, semiannual survey of fishes in the stated 
territorial sea as described by a three nautical mile wide border extend- 
ing from Rhode Island to New Hampshire boundaries including Cape Cod Bay 
and, for survey purposes, Nantucket Sound (1,913 sq n mi). Specific 
cruise objectives were to: 1) estimate relative abundance of groundfish 
and certain shellfish species in terms of weight and number; 2) determine 
periodic trends in finfish abundance, population structure, and species 
composition; 3) collect information on age and growth, maturity, food 
habits, mortality, and recruitment; 4) describe fish distribution in 
relation to temperature, salinity, and depth. 

The 1978, 1979, and 1980 cruises have been fully described (Howe 
et al 1979; Howe et al. 1980; Howe et al. 1981). Semiannual cruises 
from 1981 to the present have also been conducted; however, reports on 
these later cruises have been delayed due to a change of computer systems 
and the subsequent conversion of groundfish survey analysis programs at 
the Northeast Fisheries Center (NEFC). This report summarizes the 
general status of major fisheries resources noted on the 1981 cruises 
(#927 and #928). 



FIELD AND ANALYTICAL PROCEDURES 

The stern trawler F/V FRANCES ELIZABETH (55', 170 SHP) was char- 
tered for spring and autumn bottom trawl surveys as it had been in prior 
years. The DMF provided a 3/4 North Atlantic type two seam trawl (39' 
headrope/51' footrope). Net mesh varied depending upon the section (3.5, 
2.5, 1.5") and the stretch-mesh codend liner measured 0.64 cm (0.25"). The 
trawl was fished with a rubber disc (3.0") chain sweep, rectangular 
wooden doors (.6* x 40", 325 lbs), and 10 fathom legs. 

The study area was divided into physiographic regions which were 
subdivided into depth zones, i.e., strata (Figure 1). One hundred sta- 
tions were allocated to strata approximately in proportion to the area 
of each stratum (Table 1); however, general station locations were not 
pre-selected from a table of random numbers which would be necessary in a 
strict stratified random design. The daily objective was to achieve a 
well-spaced station distribution pattern within a 10-hr daytime sampling 
period following the general station allocation scheme. At sea, the 
vessel captain and chief scientist decided on a general itinerary; 
thereafter, the captain continually searched for towable bottom. Usually, 



the first-encountered trawlable bottom was sampled. With one exception, 
this method of station selection was utilized in all survey regions for 
the first eight survey cruises. Beginning on cruise 926 (autumn, 1980) 
and only in region 4, we adopted a randomized pre-selection method to 
locate stations within each stratum. Recognizing that most of Cape Cod 
Bay is towable, we instituted this change in procedure to remove the 
obligation of station selection from the vessel captain and to minimize 
steaming time. With the trawl warp scoped at 3:1, 20-minute tows were 
made along depth contours at a speed of 2.5 knots. 

In processing the catch, standard survey techniques and trawl logs 
were employed. Following the catch sort by species, weights and length- 
frequencies were recorded. Materials for ageing, requested special sam- 
ples, and biological observations were routinely collected during the 
measuring process. 

Standard survey abundance indices were computed using NEFC soft- 
ware and the Woods Hole Oceanographic Institute's Digital VAX-11 computer 
following auditing of station and catch data. Individual strata were 
grouped by region (strata set) to make data meaningful for resource 
managers (Figure 1). The regions are: 1) Buzzards Bay, Vineyard Sound, 
and coastal water- south of Martha's Vineyard; 2) Nantucket Sound; 3) East 
of Cape Cod, Race Point to Muskeget Island; 4) Cape Cod Bay; and, 
5) Massachusetts Bay north to the New Hampshire border. 

In this report we describe the abundance and distribution of 26 
species which dominate bottom trawl catches and/or are of principal 
importance to research and management responsibility (Table 2). For each 
species, we present two survey indices: the stratified mean catch per 
tow (kilograms and number) for all strata sets, 1978-1981, and the strati- 
fied mean number per tow by length frequency interval (cm) and region, 
1981 (Tables 5-57). 



RESULTS AND DISCUSSION 

A total of 355,909 individuals weighing 38,868.1 kg of 95 fish and 
shellfish species was collected and processed during the 1981 surveys. 
Many individuals were biologically sampled for ongoing studies by NEFC 
and DMF scientists (Table 3). Except for a very unusual catch of blue 
mussels, 13 species made up 91% of catch weight and, along with longfin 
squid, butterfish, and bay anchovy, accounted for 81% of the total catch 
in number (Table 4). 

SPRING CRUISE #927 

For predominant species, the 1981 spring cruise showed an unusual 
and conspicuous increase in abundance over the previous year. Total 



biomass (weight) and number for all species showed a 60% and 11% increase, 
respectively, over previous highs in the spring timeseries. 

Beginning with the species principally caught by us in the inshore 
waters of the inner Gulf of Maine (regions 4 and 5), catch biomass of 
the following species more than doubled over that of 1980: red hake, 
white hake, witch flounder, American lobster, longhorn sculpin, rock crab, 
and ocean pout. Species displaying less striking increases included 
yellowtail flounder (up 63% and 136% in biomass and number, respectively), 
silver hake, and American plaice. Silver hake increased 14% in biomass 
and the number index, like that of yellowtail flounder, was the highest 
in the timeseries; one- and two-year-olds were unusually plentiful for a 
spring survey. American plaice (dab) biomass and number indices were up 
35% and down 17% respectively, reflecting growth of the strong 1979 
year class and the presence of an apparently weaker 1980 year class. 

Haddock remained in very low abundance in state waters. We found 
numbers of age 1 fish (1980 year class) comparable to numbers of the 
1979 cohort a year earlier. Atlantic herring, normally a common component 
of spring catches north of Cape Cod, were scarce. Age 2 herring (13-15 cm) 
were about one-half as abundant as in 1980. 

For Atlantic cod, combined strata set indices (up 12% and 27% in 
biomass and number, respectively) mask apparent trends observed for indi- 
vidual stocks. Juveniles ( < 37 cm) classified by the NEFC as Gulf of 
Maine stock were especially plentiful throughout Cape Cod Bay where there 
was a 2.6-fold increase in number from the 1980 spring survey. Juveniles 
of the Georges Bank stock were virtually absent from the outer Cape Cod 
region; however, here and in southern Massachusetts regions, young-of- 
the-year (YOY) were ubiquitously distributed and six times more abundant 
than on any previous spring survey. 

Biomass of both sand lance and spiny dogfish, mainly taken along 
outer Cape Cod and the nearby islands, was greater than in 1980 by 12%. 
Winter (big) skate biomass increased dramatically (177%) and numbers 
quadrupled. 

Greater biomass and numbers were also noted for many of the pre- 
dominant warm temperate and mid-Atlantic species, which return to southern 
Massachusetts waters in May. Summer flounder (fluke) of age group 3 and 
older, taken primarily in regions east and south of Cape Cod, were up 
threefold in number. For the first time in four years, two-year-olds 
( < 33 cm) made a significant appearance in survey catches. Also unusual 
was the simultaneous inshore arrival of one-year-old and adult scup. 
Sixteen times the previous spring's catch of yearlings occurred, although 
overall biomass was down 59%. 

Little skate and northern searobin, both very common but virtually 
unutilized, were 2.2 times more abundant. Also more plentiful were 



black sea bass, tautog, and windowpane. Exceptions to the elevated biomass 
noted in spring 1981 were butt erf ish and longfin squid, each lower by 
about 75% than in 1980. 

Of coastwide interest, winter flounder (blackback) biomass increased 
by 32%. Biomass nearly doubled in regions north of Cape Cod although it 
declined slightly in regions south of Cape Cod. Regional 1981 prerecruit 
indices (stratified mean no. /tow for fish j< 27 cm) were higher in all 
regions compared to 1980. 

Of the 26 predominant species mentioned, 20 were observed to be at 
a higher level of biomass than the previous year; nine species were 100- 
300% higher. Fifteen species were observed at record biomass levels and 
four .other species at record number levels for the four year timeseries. 
Since abundance and/or spatial distribution of fish stocks is related to 
sea temperature variation, it is perhaps no coincidence that in each depth 
stratum, we observed the lowest average bottom temperature in the time- 
series (Table 58). As shown below, average coastwide surface and bottom 
water temperatures were lower by less than 1° C. 

SPRING 

Average Temperature (°C) Average Salinity (°/oo ) 

Cruise Dates Surface Bottom Surface 

1978 12 May- 11 Jun 13.1 10.7 31 

1979 30 Apr-27 May 11.2 8.9 31 

1980 5 May-24 May 10.6 9.1 32 

1981 6 May-21 May 9.8 8.5 31 

To what extent the observed temperature change ( < 1° C) is responsible for 
differences in abundance is unknown. 

AUTUMN CRUISE #928 

Undertaken when bottom water temperatures are usually near their 
seasonal maxima, inshore survey catches in September generally reveal 
a low biomass of adult groundfish and abounding numbers of Y0Y. In 
diametric contrast to the spring survey undertaken four months earlier, 
and in comparison to all previous autumn surveys, the 1981 autumn cruise 
was unique for its relative scarcity of groundfish. Compared "Co fall 
1980, 19 of the 26 predominant species were observed to be less abundant 
in biomass; 17 species were lower in number. Ten species were found to 
be at their lowest numerical level in the timeseries. 

As in the spring, temperature conditions may have been an important 
contributing factor to these anomalies. Average inshore bottom water 
temperature (statewide) was the highest we have observed and was 1.1° C 
higher than in 1980, as is shown below: 



AUTUMN 
Average Temperature (°C) Average Salinity (°/oo ) 
Cruise Dates Surface Bottom Surface 

1978 5 Sep- 2 Oct 16.1 12.8 32 

1979 11 Sep- 4 Oct 15.3 12.6 31 

1980 8 Sep-29 Sep 17.8 14.3 32 

1981 14 Sep- 5 Oct 16.4 15.4 32 

Annual mean temperature differences between 1981 (Table 58) and previous 
years were especially pronounced in sampling regions north of Cape Cod, 
where average bottom temperatures were a minimum of 2.0° C warmer than 
those encountered on previous surveys . 

North of Cape Cod, temperature-sensitive flounders were conspicuous 
in their absence. American plaice, yellowtail flounder, and witch 
flounder (grey sole) were about 70% less plentiful than in 1980. Yellow- 
tail were observed at significantly reduced levels (1.65 kg/tow and 6.83 
fish/tow) from 1980 (3.55 kg/tow and 24.75 fish/tow). Winter flounder 
were 27% lower in number. - - — 

Unlike past autumn surveys, virtually no Y0Y Atlantic cod or had- 
dock were taken. Number indices of age 1 cod and haddock equalled 
respective indices of 1980, suggesting that the 1979 and 1980 year-classes 
of each species were of comparable stength. 

Number indices of mainly juvenile white hake and silver hake were 
20% lower than in 1980. For the latter species, our declining index of 
prerecruit-size (16-24 cm) fish might suggest that 1979, and possibly 
1980 cohorts of the Gulf of Maine stock were weaker than the two prior 
year classes. Continuing a four-year upward trend, red hake surged to a 
high weight and number index. 

The rock crab, believed to increase activity with elevated water 
temperature, is usually more available to the survey gear in September as 
evidenced by higher catches; however, in 1981, catch indices plummeted 
significantly - biomass and number were lower by 96% and 90%, respectively. 
It is unknown whether the rock crab's apparent collapse was due to a marked 
change in availability or, possibly, offshore movement. American lobster 
biomass was 17% higher than in 1980, and I llex or shortfin squid, rare in 
survey catches one year earlier, were taken in substantial numbers. 

South of Cape Cod, the third consecutive and sharp rise (56%) in the 
summer flounder number index reflected the increased presence of age 2 
fish, not available a year before. Their relative abundance indicated 
that the 1979 year class was probably stronger than preceding cohorts 
surveyed in Massachusetts. 






Predicting future recruitment from the systemmatic processing of 
great numbers of autumn- sampled YOY remains an intriguing possibility, 
particularly for species such as longfin squid, scup, black sea bass, 
and butterfish. For each species except Loligo squid, the 1981 overall 
autumn indices (all ages) and YOY indices declined. The prerecruitment 
index. (number per tow at age 0) for scup from the 1981 autumn survey 
(871./) declined 20% from the 1980 index (1,090.3); the black sea bass 
index fell 34% (51.8 to 34.3); and the butterfish recruitment index 
dropped 81% (405.7 to 75.7). The Loligo prerecruit index was 4% higher 
(171.8) than in 1980 (165.1) and overall biomass was 18% higher. 

Except for spiny dogfish, which were only prominent east of Cape 
Cod (311.3 kg/tow), most other dominant but commercially unimportant 
species were lower in biomass by 25-47%. These included longhorn 
sculp in (42%), tautog (25%), northern searobin (28%), windowpane (34%), 
little skate (47%), and winter skate (25%). 

Major trends in abundance of predominant species should become 
evident in survey data over the long term, although trends are less apt 
to be discernable in any given inshore survey due to the study area's 
environmental conditions, which tend toward extremes. The comparatively 
depressed-spring and elevated autumn sea temperatures that occurred 
during our 1981 surveys undoubtedly stimulated delays in the offshore 
(spring) /onshore (autumn) movement of many groundfish stocks and possibly 
affected the production and/or distribution of offspring, most noticeably 
of non-endemic species. Availability of some species to trawl gear might 
also have been temporarily altered (e.g., rock crab). These apparent 
distributional fluctuations would not necessarily signify population 
abundance or structure changes. Only by comparing past and future survey 
data can the 1981 phenomena be properly interpreted. 



ACKNOWLEDGEMENTS 

Since the 1981 survey cruises were completed, two passing years 
have seen changes with respect to project personnel, the vessel and 
fishermen, and data processing. In 1981, project members Frank Germano 
and Jim Buckley played significant roles in the collection of this data 
as did fellow employees Mark Galkowski and Bruce Estrella, both of whom 
augmented project personnel aboard the survey vessel during a period of 
deficient staffing. We thank 22 additional Division employees who 
assisted us at sea and others who helped with logistical details. 
W. Leigh Bridges administered the project and reviewed this report. 

Cruise #928 marked the eighth, and last, survey conducted aboard 
the chartered F/V FRANCES ELIZABETH. Owner and contractor Daniel A. 
Arnold, Captain David Arnold, and Antone Pinto, in our judgement, adhered 



to as high a standard of enthusiasm, cooperation, and dedication on the 
last cruise as they did on the first. We could not have received a 
finer record of performance from any contractor. 

Significant problems in data processing were resolved in recent 
months with the assistance of the DMF's Don Maclsaac and a number of 
NEFC employees, without whose willingness to troubleshoot and communicate 
with us, this report would not have been possible. We specifically 
thank Wayne Hoover, Phil Chase, Linda Despres-Patanjo, Malcolm Silverman, 
and Loretta O'Brien. Donald Flescher provided timely sampling manuals 
and, along with Michael Fogarty, volunteered a day at sea with us. 



REFERENCES 

Howe, A.B., D.B. Maclsaac, B.T. Estrella, and F.J. Germano, Jr. 1979. 

Coastwide Fishery Resource Assessment. Mass. Div. Marine Fish. 1-37 

, B.T. Estrella, F.J. Germano, Jr., J.T. Buckley, and D.B. Maclsaac. 

1980. Coastwide Fishery Resource Assessment. Mass. Div. Marine 
Fish. 1-26. 



F.J. Germano, Jr., J.T. Buckley, D. Jimenez, and B.T. Estrella. 
1981. Coastwide Fishery Resource Assessment. Mass. Div. Marine 
Fish. 1-32. 



Figure 1, 



DEPTH STRATA Oems) 




Sampling strata used 
in Massachusetts DKT 
inshore bottom trawl 
survey. 



Table 1. Allotment of sampling effort 
to Massachusetts inshore 
strata, 1981 survey cruises. 







Stratum 


Depth 


Range 


Area 


Number 


Stations 


Reg 


ion 


No.* 


Meters 


Feet 


(sq n mi) 


Spring 


Autumn 


1. 


Buzzards Bay 


11 


< 9.3 


< 30 


102 


5 


6 




Vineyard Sound 


12 


9.4-18.3 


31- 60 


160 


8 


7 




and coastal 


13 


18.4-27.4 


61- 90 


88 


4 


4 




water south of 


14 


27.5-36.6 


91-120 


16 


2 


2 




Martha's Vineyard 














2. 


Nantucket Sound 


15 


< 9.3 


< 30 


190 


10 


10. 






16 


9.4-18.3 


31- 60 


212 


11 


11 


3. 


East of Cape Cod, 


17 


< 9.3 


< 30 


85 


4 


4 




Race Point to 


18 


9.4-18.3 


31- 60 


88 


5 


5 




Muskeget Island 


19 


18.4-27.4 


61- 90 


39 


2 


2 






20 


27.5-36.6 


91-120 


24 


2 


2 






21 


36.7-54.9 


121-180 


40 


2 


2 


4. 


Cape Cod Bay 


25 


< 9.3 


< 30 


47 


2 


2 






26 


9.4-18.3 


31- 60 


87 


5 


5 






27 


18.4-27.4 


61- 90 


94 


5 


4 






28 


27.5-36.6 


91-120 


93 


5 


5 






29 


36.7-54.9 


121-180 


103 


5 


5 






30 


>55.0 


>181 


32 


2 


2 


5. 


Massachusetts Bay 


31 


< 9.3 


< 30 


41 


2 


2 




north to New 


32 


9.4-18.3 


31- 60 


49 


2 


2 




Hampshire border 


33 


18.4-27.4 


61- 90 


78 


4 


3 






34 


27.5-36.6 


91-120 


38 


2 


2 






35 


36.7-54.9 


121-180 


174 


6 


5 






36 


>55.0 


>181 


33 


2 


3 



Sampling strata begin with #11 to coordinate with Rhode Island survey design, 
Strata #22-24 have been allotted to Nantucket Shoals should survey coverage 
be eventually extended seaward. 



Table 2. Common and scientific names 
of species mentioned. 



COMMON NAME 



SCIENTIFIC NAME 



Groundfish (except flounders) 

Atlantic cod 

Haddock 

Silver hake 

Red hake 

White hake 

Scup 

Black sea bass 

Tautog 

Ocean pout 

Northern searobin 

Longhorn sculp in 



Gadus morhua 
Melanogrammus aeglefinus 
Merluccius bilinearis 
Vrophyois chuss 
Urophycis tenuis 
Stenotomus chrysops 
Centropristis striata 
Tautog a onitis 
Maorozoarces americanus 
Prionotus carolinus 
Myoxocephalus octodecemspinosus 



Flounder 



Yellowtail flounder 
Winter flounder 
Summer flounder 
American plaice 
Witch flounder 
Windowpane 

Pelagics: 

Atlantic herring 
Butterfish 
Sand lance 

Cartilaginous fish: 

Spiny dogfish 
Little skate 
Winter skate 



Limanda ferruginea 
Pseudopleuronectes americanus 
Paralichthys dentatus 
Hippo glossoides platessoides 
Glyptocephalus cynoglossus 
Scophthalmus aquosus 



Clupea harengus harengus 
Peprilus triacanthus 
Anmodytes sp. 



Squalus acanthias 
Raja erinacea 
Raja oceViata 



Shellfish: 



Longfin squid 
American lobster 
Rock crab 



Loligo pealei 
Homarus americanus 
Cancer irroratus 



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zt 


in 


LO 


• 


r- 


O 


Cn 


ID 


J- CO CO 


Zj" 


r>- «co 




u, 


rH 


f-\ 


cn 


CO O 


r-i 


CM 


3- 


CO 


rH rH CM 


CO 


H rH rH 



CM 
CD 

0) 

w 

•H 
P 
P 

o 



E- 
W 
PQ 

< 

to 

n 
•J 

U 

CO 

w 
o 



rd 
2 



CM 



CM 

cn 



CD 



S5 








• 










tn 


cn 
















s 


1 






O 










CM 


• 


rH 




















N»^ 










I 


o 


cn 














ta- 


>> 








o 








a> 


CM 


(D 




ID 


CD 


CD 








rd 






ID 


• 








^^• 


CO 


* 




rH 


Zf 


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• 


> 


E 






CD 


zl- 




zj- 






■1 


CM 




CM 


O 


CM 


CN 


CO 






in r>- 




• 


00 


GO 


CO 


O 


r~- 


m 


CM 




•V 


M 


•t 


CM 


CD 


u, 


(D 


w-\ cn 


zT 


O 

•-^ 
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rH 


rH 


in 


f- 


rH 


CM 


rH 




rH 
CO 

CD 


rH 


f-^ 


CO 


p 

p 
c 

•H 

E 

o 

CM 

c 

rd 
X 
P 










E 
C 

CD 
bO 
C 
rd 






rd 

CD 
CO 




CD 

bO 
C 
rd 

c 

rd 


bO 






rH 

D, 
E 
rd 
CO 

^> 
p 

•H 

r4 

p 


CO 
C 

CD 

E 

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CO 

c 
o 

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P 

rd 
> 

CD 




CO 
CO 
CD 
H 

ip 
O 

c 
o 










TJ 






P 


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M 




TJ 


p 


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c 






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rd 


CD 


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p 


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CD 




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a) 




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CO 


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p 




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CO 


X 


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CO 


bO^ 


a, 


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rd 


CD 


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CD 




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p 


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CD 


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E 


rd 


s 


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r-i 








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a, 


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CD 








s 


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bOr- 


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X) O 


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CD 


CO 


O 


O 


c 


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u 




o 


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CX 




P 


P 


o 


u 


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CD 






60 co 


o 


5 


x 


p 


cp 


CO 


* 


rd 


rd 


•H 


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C 


XI 


rd 


P 






c c 


X) 


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p. 


•H 




o 


o 


O 


P 




rd 


o 


♦H 


O 


>-\ 




•H O 


rd 


P 


rH 


rd 


P 


u 


c 






O 


«« 




x: 


O 


c 


CD 




r-\ »H 






CD 


a 


C 


CD 




rH 


rH 


CD 


CD 


CD 


p 


CD 


CD 


(0 


<D 


CX P 


CO 


c 


CO 




CD 


XI 


c 


rd 


rd 


r-{ 


bO 


bO 


rd 


a, 


a 


(0 


P 


E rd 


S 


rd 


CO 


tn 


•H 


E 


rd 


P 


P 


rH 


< 


< 


Ph 


CO 




cd 


rd 


rd P 


o 


CD 


CD 


s 


O 


P 


CD 


o 


O 


o 












> 


Q 


CO CO 


E-< 


s 


> 


Q 


CO 


^ 


s 


H 


E- 


o 













Table 4. Weight (kilograms) and number for species col- 
lected during the 1981 spring and autumn bottom 
trawl surveys, Massachusetts territorial waters. 

Spring Autumn 



Species 


Wt. 


No. 


Wt. 


No. 


Winter skate 


4,653.0 


4 


,051 


1,273.9 


771 


Ocean pout 


3,553.7 


6 


,552 


130.5 


465 


Northern searobin 


2,907.1 


15 


,122 


73.2 


2,123 


Little skate 


2,872.9 


5 


,719 


686.0 


1,242 


Winter flounder 


2,135.2 


7 


,153 


570.6 


2,043 


Red hake 


1,207.3 


3 


,243 


518.3 


2,783 


Windowpane 


1,113.3 


3 


,690 


108.1 


755 


Scup 


899. 4 


15 


,059 


1,310.1 


86,097 


Atlantic cod 


896.1 


4 


,664 


203.8 


549 


Yellowtail flounder 


895.4 


4 


,261 


137.6 


613 


Spiny dogfish 


720.0 




162 


4,826.2 


1,212 


Longhorn sculp in 


583.6 


3 


,593 


55.0 


361 


American plaice 


578.7 


6 


,135 


149.6 


1,230 


Tautog 


285.9 




211 


77.8 


94 


American lobster 


243.9 




873 


163.2 


611 


Sand lance 


239.6 


25 


,186 


3.2 


612 


Rock crab 


234.8 


2 


,216 


19.0 


583 


Cunner 


171.5 


4 


,209 


10.7 


157 


Silver hake 


155.5 


1 


,234 


317.6 


2,636 


Goosefish 


150.5 




12 


90.3 


17 


Smooth dogfish 


124.5 




29 


171.7 


222 


Snake blenny 


121.5 




536 


0.1 


2 


Spider crab 


120.0 




993 


11.8 


295 


Witch flounder 


106.2 




133 


14.1 


24 


Summer flounder 


102.3 




118 


67.7 


83 


Sea raven 


75.8 




129 


21.7 


50 


Black sea bass 


71.3 




121 


16.5 


3,238 


Longfin squid 


56.1 




621 


364.6 


29,958 


Pollock 


50.4 




416 


0.8 


4 


Channelled whelk 


47.7 




171 


4.8 


11 


Thorny skate 


45.3 




22 


0.9 


2 


Fourspot flounder 


45.0 




176 


23.3 


138 


Moonsnail unclass . 


40.7 




446 


6.1. 


58 


Horseshoe crab 


35.6 




40 


28.4 


18 


Atlantic herring 


34.7 




536 


8.7 


102 


Shrimp unclass. 


33.7 




- 


- 


- 


Alewife 


28.8 




420 


5.5 


26 


White hake 


25.0 




436 


84.8 


906 


Sea scallop 


21.2 




101 


5.0 


142 


Lady crab 


21.1 


1 


,250 


33.5 


1,222 


Haddock 


21.0 




148 


13.6 


48 


Blueback herring 


15.3 




335 


0.1 


10 


Knobbed whelk 


14.9 




18 


6.2 


14 


Butter fish 


9.9 




91 


245.4 


11,126 


Jonah crab 


8.7 




55 


8.6 


60 


Atlantic wolffish 


8.0 




2 


5.9 


2 



Table 4. (Continued) 



Spring 



Species 

Mussel unclass. 
Fourbeard rockling 
Grubby 

Rainbow smelt 
Rock gunnel 
Striped searobin 
Quahog 
Surf clam 
Pipefish 
Ocean quahog 
Lump fish 
American eel 
Atlantic halibut 
Wrymouth 
Alligatorfish 
Atlantic mackerel 
American shad 
Daubed shanny 
Bay scallop 
Mantis shrimp 
Moustache sculpin 
Octopus unclass. 
Bay anchovy 
Atlantic silverside 
Shortfin squid 
Atlantic stingray 
Atlantic torpedo 
Bluefish 
Sand tiger 
Northern puffer 
Oyster toadfish 
Weakfish 
Mackerel scad 
Kingf ish 
Blue crab 
Redfish 
Spotted hake 
Hogchoker 
Orange filefish 
Lizardfish 
Atlantic menhaden 
Bigeye scad 
Striped anchovy 
Snakefish 
Seasnail 
Conger eel 
Striped cusk-eel 
Gray snapper 
Gauguanche 



Wt. 


No. 


7.7 


273 


5.8 


111 


4.6 


385 


4.3 


669 


3.4 


227 


3.3 


6 


2.7 


7 


2.5 


11 


2.4 


45 


2.2 


11 


2.2 


1 


1.9 


3 


1.7 


1 


1.5 


2 


0.9 


152 


0.8 


1 


0.6 


12 


0.6 


57 


0.3 


11 


0.1 


3 


0.1 


2 


0.0 


7 


0.0 


4 


0.0 


1 



Autumn 




Wt. 




No. 


762.8 


67 


,767 


2.0 




26 


0.0 




2 


0.3 




13 


0.0 




6 


2.7 




30 


1.3 




518 


1.3 




8 


0.0 




1 


1.6 




2 


0.1 




22 


5.2 




276 


0.3 




1 



0.2 



TOTAL 



( 



25,820.9 122,691 



12.5 


10,796 


0.1 


14 


124.7 


360 


113.4 


1 


90.2 


3 


24.7 


145 


13.1 


1 


3.2 


160 


3.1 


9 


1.8 


113 


1.7 


145 


1.7 


23 


1.0 


7 


1.0 


2 


0.9 


7 


0.6 


5 


0.5 


13 


0.3 


2 


0.3 


1 


0.1 


2 


0.0 


4 


0.0 


3 


0.0 


2 


0.0 


2 


0.0 


1 


0.0 


1 


0.0 


1 


,047.2 


233,218 



Table 5. Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of all species 
for all Massachusetts inshore strata sets , 
spring and autumn, 1976 - 1981. 



SPRING 





Mean 




V?t./tow 


1978 . 


176.01 


1979 


169.16 


1980 


161.70 


1981 


258.11 



95% Confidence Mean 
Limits No. /tow 



112.91-239.11 



139.08-119.25 



113.80-209.61 



21U.6U-301.58 



833.07 



718.70 



1099.83 



1220.09 



95% Confidence 

Limits Wt./Nc, 



492. 91-1173. 23 0.21 



524.56- 912.83 0.24 



426.90-1772.76 0.15 



971.43-1468.74 0.21 



AUTUMN 



1978 


315.38 


1979 


139.74 


1980 


120.04 


1981 


134.50 



135.23-495.53 



101.91-177.58 



90.12-149.96 



71.30-197.71 



3310.90 



2029.87 



2711.74 



2517.17 



2279.92-4341.88 0.10 



1604.97-2454.77 0.07 



2019.01-3404.48 0.04 



507.91-4526.42 0.05 



Negative lower limit 



Table 6. Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of Atlantic cod 
for all Massachusetts inshore strata sets, 
spring and autumn, 1976 - 1981. 



SPRING 





Mean 


95% Confidence 


Mean 


95% Confidence 






Wt./tow 
5.63 


Limits 


No. /tow 
45.67 


Limits 


Wt./No. 


1978 


3.66- 7.59 


21.34- 70.00 


0.12 


1979 


9.85 


3.15-16.56 


54.12 


23.71- 84.53 


0.18 


1980 


9.08 


6.07-12.10 


39.63 


27.33- 51.94 


0.23 


1981 


10.22 


3.62-16.82 


50.35 


32.63- 68.07 


0.20 



AUTUMN 



1978 


1.47 


* - 3.52 


1979 


0.50 


0.06- 0.94 


1980 


0.75 


0.17- 1.33 


1981 


3.06 


* - 6.72 



76.25 



4.04 



7.11 



7.80 



8.19-124.32 


0.02 


1.67- 6.41 


0.12 


2.57- 11.65 


0.11 


* - 15.66 


0.39 



" Negative lower limit. 



ifcU 



Stratified mean number per tow (untransformed) for Atlantic cod 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 









SPRING 










AUTUMN 
















Regions 






h 1 
























1 


2 


3 


4 


5 


1 


2 


3 


4 


5 


2 


.055 








.189 












3 


.439 


.477 


.383 




4.119 












4 


3.404 


2.774 


3.524 


.317 


11.142 












5 


10.098 


8.765 


9.639 


1.360 


15.241 










0.027 


6 


14.056 


8.666 


8.078 


.925 


5.902 












7 


il.054 


2.827 


1.387 


.314 


1.335 












B 


■4.4-19 


1.676 


.268 


.121 


.119 












9 


.82? 


.096 


.064 


.041 


.119 












10 


.060 






.038 


.391 




* 




0.052 


0.253 


11 








.079 


.059 












12 




• 


.071 


.411 


.178 








0.103 


0.483 


13 




- 




.936 


1.645 






0.217 




0.690 


14 








.914 


2.551 






0.435 


0.035 


0.475 


15 






.. 


.6?5_ 


2.832 






0.652 




0.445 


16 


"' " ~ 






.328 


1.367 






0.797 




0.774 


17 








.564 


1.527 






0.652 




0.176 


IE 








.523 


2.050 






0.362 




0.253 


19 








.739 


1.866 






0.435 






20 


.044 






1.310 


3.845 






0.217 




0.169 


21 








1.642 


3.372 






0.217 


0.035 


0.253 


22 








1.897 


2.860 










0.383 


23 


.060 






1.964 


2.006 






0.145 




0.421 


24 








1.478 


2.191 






0.145 


0.035 


1.158 


25 








.703 


1.725 










0.421 


26 






.141 


.832 


.774 










1.348 


27 








.583 


2.294 








0.070 


0.758 


2£ 






- 


.761 


1.505 




'' 




0.316 


1.601 


29 


i 

i 






.292 


1.609 






0.145 


0.316 


1.011 


3D 


! 






.505 


2.496 






0.145 


0.526 


0.927 


31 


i 




.043 


.128 


1.972 






0.145 


0.491 


0.843 


32 






.043 


.125 


3.262 








0.702 


0.758 


33 






.072 


.257 


4.143 








0.421 


0.758 


3* 


i 






.579 


3,. 845 


» 






0.526 


•0.758 


3 5 


i 






.361 


3.039 








0.491 


1.601 


36 








.714 


4.747 








0.491 


1.180 


37 








.561 


3.808 








0.140 


1.095 


3E 








.914 


2.199 








0.035 


1.011 


3? 


i 






.661 


1.425 








0.070 


1.264 


to 








.682 


3.617 










1.011 


41 








.440 


2.392 








0.070 


1.038 


42 








.176 


.706 








0.035 


0.927 


43 








.360 


1.271 










0.337 


44 






.072 


.161 


1.260 










0.616 


45 








.045 


1.013 










0.421 


1 

46 








.082 
.179 


.753 
.483 










0.169 
0.169 


47 

1 1 






.072 


.159 


1.372' 










0.364 


th 
















• 

i 



?able 7. (Cont.) 



SPRING 



AUTUMN 



Regions 



Length 
(cm) 



9 

5o 
i 

2 
3 

4 
5 
6 
7 
E 
9 

6: 

] 

2 
3 

.5 

6 

7 
6 
9 

7o 

1 

7 



6 

7 
6 
5 !l 

r 

Be 

1 

2 
3 

4 

7 
E. 



Total 
x Length 



.072 



.072 
.072 



072 



.043 
.072 



.132 
.169 

.086 
.052 

.083 
.132 
.041 
.038 
.045 
.086 
.041 
.041 
.221 
.090 



.045 



.163 

.473 
.117 
.512 
.318 

.410 
.047 
.186 

.567 
.134 
.366 
.047 
.070 



.140 
.070 



.041 



090 



045 
045 





' 0.169 




0.111 




0.337 


0.035 


0.084 


0.035 




0.035 





070 



040 



0.169 

0.027 
0.084 
0.084 



icioxe ' • v oorix . ; 



SPRING 



AUTUMN 



Regions 



9 

9o 
1 

2 
.3 

4 

S- 
.6 

7 

6 
.9 

lQc 

i 

2 

3 

4 
« 

7 

t • 
c 

M: 

no !: 

l 

2 
3 



6 
7 
E 
9 

12 o 
1 

2 
.3 

4 

.5 
6 
.7 



tal 
^ength 



.043 



.041 



44.51 
6.13 



25.280 
5.63 



24.310 
6.98 



28.423 
25.60 



122.346 
22.53 



4.710 
18.28 



5.067 
32.21 



27.410 
31.89 



Table 8. Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of haddock 
for all Massachusetts inshore strata sets , 
spring and autumn, 1978 - 1981. 



SPRING 





Mean 


95% Confidence 


Mean 


95% Confidence 






Wt./tow 

0.27 


Limits 


No. /tow 

• 

0.46 


Limits 


Wt./No. 


1978 


0.02-0.53 


0.04- 0.87 


0.60 


1979 


0.02 


* -0.04 


0.12 


* - 0.28 


0.15 


1980 


0.27 


0.11-0.44 


2.12 


0.75- 3.49 


0.13 


1981 


T).25 


- - 0.07-0.43 


1.94 


0.59- 3.29 


0.13 



AUTUMN 



1978 


0.00 


0.00-0.00 


0.01 


* - 0.02 


0.00 


1979 


0.06 


0.04-0.08 


7.19 


4.43- 9.94 


0.01 


1980 


0.16 


0.05-0.28 


7.83 


• 2.56-13.09 


0.02 


1981 


0.14 


* -0.33 


0.52 


* - 1.11 


0.27 



Negative lower limit. 



I I od! 



liib2e 9, 



Stratified mean number per row (untransiormed) for haddock 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



1 


1 


2 


3 


4 


5 


1 


2 


3 


4 


5 


1 

2 






















3 






















A 






















5 






















6 






















7 
6 




















0.111 


9 


• 




















10 
11 




















0.169 


12 






















13 






















14 






.072 




.070 












15 


i 




- 




.140 












16 






.072 




.327 












17 










.421 












IE 


i 
i 




.116 


.105 


.351 












1 C 


1 






.111 


.608 












20 
2) 


i 
i 






.392 
.211 


1.311 
.843 












22 






.043 


.105 


.772 












22 








.035 
.070 


.772 
.562 








0.035 


0.084 


24 

25 
26 








.111 


.492 








0.035 


0.084 








.045 










0.070 




27 








.070 


.211 








0.070 




« 










.140 








0.105 
0.140 


0.169 
0.169 


w i 
















0.140 


0.084 


50 1; 
















0.140 


0.084 


31 


i 

i 
















0.140 




32 






















33 


i 








.070 








0.175 




3-« 
35 


i 
i 








■ 








0.070 
0.105 


0.0«4 


36 


j 




















37 


i 
i 








.070 












3c 


.I 








.070 












39 


i 




















4C 






















41 










.040 












42 






















43 










.040 












44 


i 




















45 


i 
i 




















46 






- 
















47 






















5th 


|! 










i 











II 



00= 



Table 9. (Cont.) 



SPRING 



AUTUMN 



Regions 



gth 



9 

5o 

l 

2 
3 

4 

5 

6 

7 

8 

9 

60 

] 

2 

3 

4 

5 
6 

7 

t 

9 

7c 

i 

2 

3 

t 

6 
7 
8 
9 
80 
1 
2 
3 

4 

5 
6 

7 



1 

ngth 



.040 



J 3 



.04CT 



.304 
17.14 



1.255 
21.44 



7.391 
22.00 



1.228 
30.40 



1.038 
23.59 






Table 10. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of silver hake 
for all Massachusetts inshore strata sets , 
spring and autumn, 1978 - 1981. 



SPRING 





Mean 


95% Confidence 


Mean 


95% Confidence 






Wt./tow 
0.63 


Limits 


No. /tow 
4.85 


Limits 


Wt./No. 


1978 


0.24-1.02 


2.70- 7.00 


0.13 


1979 


1.89 


* -3.92 


7.72 


3.02-12.41 


0.24 


1980 


1.51+ 


* -3.13 


10.65 


3.63-17.67 


0.14 


1981 


1.76 


0.60-2.93 


15.34 


5.89-24.7? 


0.1.2 



AUTUMN 



1978 


1.86 


0.75-2.98 


1979 . 


3.11 


2.16-4.05 


1980 


3.27 


0.81-5.74 


1981 


3.61 


2.41-4.82 



45.38 



41.74 



34.62 



27.60 



19.16-71.60 


0.04 


32.93-50.55 


0.07 


17.56-51.69 


0.09 


18.69-36.51 


0.13 



Negative lower limit. 



V-ble 11. 



Stratified mean number per tow (untransfcrmed) for silver hake 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 









SPRING 










AUTUMN 












Regions 








1 


2 


3 


4 


5 


1 


2 


3 


4 


5 


1 

2 

3 

4 
















.071 






5 








.041 








.191 






6 










.140 


.781 




.651 


.121 




7 










.361 


1.880 




.346 


.129 




6 








.339 


.501 


3.789 




.332 


.052 




9 


.164 




.'064 


.620 


.806 


1.598 










10 


.060 


.096 


.128 


.995 


2.129 


.921 




.134 


.038 


.027 


11 


.116 






.788 


4.552 








.035 


.027 


12 


.231 


.096 




1.014 


4.808 


.046 






.070 




13 


.120 




.141 


.764 


5.253 






.116 


.527 


.390 


14 








.367 


4.254 






.116 


.753 


.961 


15 








- .292 


_2-870 






.391 


.940 


1.318 


16 








.045 


.978 






.609 


1.041 


1.682 


17 










.678 






.739 


1.988 


.677 


I / 

16 


i 






.123 


.834 






.652 


3.510 


1.382 


19 








.082 


1.108 






2.551 


4.633 


.676 


2C' 










.979 






2.638 


5.170 


1.006 


21 


1 
i 






.045 


1.355 






5.493 


6.218 


.721 


22 


1 






.121 


1.356 






5.681 


4.591 


.133 










.267 


1.427 


.022 




2.174 


4.045 


.222 


23 










- 












24 








.439 


1.049 






1.710 


3.016 


.279 


25 








.620 


1.234 






.623 


1.901 


.658 


26 


.240 






.434 


1.391 






1.377 


2.748 


1.060 


27 


! .361 






.636 


1.381 








2.823 


1.251 


2£ 


.224 




.185 


.939 


1.541 








2.500 


3.579 


29 


; .404 




.141 


.770 


1.053 








3.172 


2.435 


•; r\ 


.973 




.141 


.484 


1.988 








3.383 


2. 435 


31 


.541 




.424 


.312 


.516 








1.621 


2.741 


32 


.574 




.283 


.312 


.719 








1.927 


1.523 


33 


.262 




1.272 


.041 


.631 








1.862 

•> 


1.332 


34 


.137 




1.130 


.168 


..117 








1.465 


1.486 • 


35 


.164 




.989 


.045 


.375 








.879 


.410 


36 


.022 




.848 


.041 


.281 








.467 


.475 


37 


.060 




1.272 


.041 


.140 








.612 


.130 


36 


.104 




.283 


.086 


.070 








.522 


.084 


39 


| 


.048 


.141 


.041 










.226 


.169 


40 


.137 




.989 


.045 


.281 








.316 


.222 


! 

41 




.048 






.047 








.251 


.195 


42 


.055 




.141 


.086 


.092 








.090 


.299 


43 








.079 


.117 








.261 


.111 


44 






.283 




.070 








.045 


.337 


1 45 




1 


















46 










.070 








.271 


.111 


47 


.022 








.070 








.045 




4 C 


! .022 
















.206 




£fc 


1 

i 






| 


I 






| 



Tsb^e u. CCont. ) 



SPRING 



AUTUKN 



Regi*>n& 



gtTT" 



J^ 



Jk 



X. 



X- 



5c 



1 

2 

3 



3i 

6c I 

i 

2 

3 

I 

4! 
I 

6 

7 

a 

9 



* 



■> l 



'I 

8: I 



1 



022. 



.070 



5,013 I .288 
28.50 i 20.67 



8.854 
34.58 



11.521 47.697 
20.45 18.49 



9.037 
3.06 



.084 



.084 
.084 



.084- 



26.596 
20. 25 



64.469 I 33. 5~? 
24.54 I 27.0 



Table 12. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of red hake 
for all Massachusetts inshore strata sets , 
spring and autumn, 1978 - 1981. 



1978 



SPRING 

Mean 95% Confidence Mean 
Wt./tow Limits No. /tow 



3. 40 



ft - 7.70 



11.12 



95% Confidence 

Limits Wt./No, 



.t. 



* -26.00 



0.31 



1979 



11.85 



ft -27.02 



33.71 



ft -74.54 



0.35 



1980 



3.03 



1.24- 4.81 



16.00 



2.62-29.38 



0.19 



1981 



12.01 



ft -28.46 



34.77 



2.06-67.48 



0.34 









AUTUMN 






1978 


2.57 


1.83- 3.31 


8.31 


5.47-11.14 


0.31 


1979 


2.75 


1.84- 3.66 


12.77 


6.66-18.88 


0.22 


1980 


3.44 


1.77- 5.10 


18.09 


7.44-28.73 


0.19 


1981 


6.12 


3.68- 8.57 


32.87 


19.93-45.80 


0.19 



ft Negative lower limit. 



lable 13. 



Stratified niean number per tow (untransformed) for red hake 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



' i 1 


2 


3 


4 


5 


1 


2 


3 


4 


5 


2 

3 i .056 














0.765 






1 

4 






.041 








0.255 






5 






.041 








1.786 






A 














2.551 






° 

;i ..... 














2.551 












.070 


0.175 




0.765 




0.063 


D 

9 






.076 


.281 






1.530 






10 ; 






.658 


1.707 






0.255 


0.045 




11 






.536 


2.668 












12 


.096 




1.069 


3.441 












n .060 


.144 




1.101 


5.546 












i 
14 i 


.048 


.071 


.692 


2.877 












1 

15 | 


.048 


. 


•-. 611 


3.017 






. 




0.364 


,6 - 060 


.144 




.699 


2.380 








0~090 


* 0.889 


17 .022 


.048 




.856 


2.333 


0.022 






0.244 


4.339 


le 


.048 




.328 


1.866 


0.022 






0.382 


6.818 


1 o 






.288 


.521 


0.044 






0.668 


7.791 


19 1 

.,, ! .022 






.041 


1.358 


0.044 






1.336 


11.407 


4. J 

,, .066 






.214 


.632 


0.022 






1.184 


8.308 


■L I 

22 






.041 


.116 


0.044 






3.359 


4.966 


51 








1.053 


0.022 






5.996 


4.092 


2i .060 






.045 


1.585 








6.273 


1.329 


25 .060 






.210 


1.585 


0.022 






4.167 


2.175 


26 






.127 


1.545 








3.859 


1.113 


27 .120 






.258 


1.103 








1.933 


1.015 


ie .306 






.503 


1.374 








1.120 


0.954 


29 1.109 






.312 


1.274 








1.080 


0.747 


30 1.027 






.752 


2.992 








1.279 


0.696 


3i .596 




.918 


.418 


.890 








1.696 


2.781 


32 1.016 




.918 


.553 


1.559 








2.389 


2.275 


33 .721 






.453 


1.334 








1.839 


3.323 


u 1.071 




3.745 


.164 


..621 








1.823 


1.638 


35 " .902 




.918 


.286 


1.023 








2.514 


1.727 


36 L077 




2.755 


.460 


.970 








1.432 


2.940 


37 | 1.262 


.048 


11.163 


.327 


1.023 








1.636 


1.428 


36 I 1.307 




20.418 


.296 


.632 








1.882 


1.592 


:«9 .689 




12.082 


.168 


.562 








1.164 


1.689 


to .579 




9.390 


.082 


1.172 








0.668 


1.140 


41 .744 




3.745 


.327 


.891 








0.583 


1.339 


{2 .579 




9.326 


.205 


.702 








0.633 


1.275 


(3 .377 




13.918 


.247 


.632 








0.643 


1.229 


u .279 




4.663 


.086 


.340 








0.723 


0.639 


is -317 




8.337 


.246 


.387 








0.386 


0.475 


16 




5.582 


.082 


.180 








0.211 


0.448 


,, .066 




3.745 


.127 


.180 








0.296 


0.279 


i c 




.071 




.059 








0.211 




• 





















iaDie iJ. iCont . J 



SPRING 



AUTUMN 



Regions 



ngth 



9 

5o 
1 

2 

3 

4 
5. 
6 
7 
8 
9 
60 
] 
2 
3 



6 

7 
6 
9 

7o 
1 

2 
3 

A 

5 
6 

7 

e 

9 

80 
i 

2 
3 

4 

7 



ength 



.066 



.918 
1.837 



.120 
.082 

.038 
.079 
.164 

.045 



.200 



.140 
.070 



14.615 

35.14 

i 



.623 
16.31 



114.520 
40.62 



14.554 
24.77 



54.891 
22.96 



0.035 


0.164 


0.125 


0.222 


0.351 




0.070 


0.053 


0.261 


0.084 


0.111 




0.196 




0.045 




0.090 




0.080 


0.084 


0.090 





0.035 



0.415 
15.26 



10.458 
6.49 



55.238 
29.58 



83.891 
25.91 



Table 14. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of white hake 
for all Massachusetts inshore strata sets , 
spring and autumn, 1976 - 1981. 



1978 
1979 
1980 
1981 



Mean 
Wt./tow 

0.95 
0.34 
0.12 
0.28 



SPRING 

95% Confidence Mean 
Limits No. /tow 



* -2.23 

* -0.77 
0.04-0.20 
0.12-0.44 



4.23 
2.23 
2.29 
4.79 



95% Confidence 

Limits V7t./No, 

0.34- 8.12 0.22 

0.82- 3.65 0.15 

0.54- 4.04 0.05 

- 2.69- 6.89 0.06 









AUTUMN 






1978 


0.80 


0.55-1.05 


13.72 


9.68-17.76 


0.06 


1979 


0.78 


0.44-1.12 


7.25 


4.42-10.09 


0.11 


1980 


1.01 


0.71-1.31 


12.91 


9.40-16.43 


0.08 


1931 


0.97 


0.54-1.40 


10.34 


5.04-15.64 


0.09 



Negative lower limit 



. - 



ihie IS. Stratified mean number per tow (untrfcns formed) for white hake 

length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



5th 
b) 



7, .055 
'! .109 



i • 



.333 
,*t37 

.224 
.060 
.055 
.055 



.048 



.096 
.144 
.048 



.048 



3;' i 



3i ,; 



064 



064 



071 



54 



072 



071 
071 



141 



.125 
.317 
.567 
.964 

1.271 

.876 

1.064 
.910 
.680 

.529 
.386 

.082 
.210 
.173 

.086 

.168 
.082 
.198 
.086 

.122 

.349 
.086 
.082 

.132 

.041 
.041 

.131 

.045 



.070 

.047 

.588 

.613 

1.397 

.553 
.492 
.331 
.493 
.329 

.377 
.212 

.282 
.844 
.235 

.070 

.421 
.211 
.419 
.184 
.324 

.419 

.232 

.070 

.046 
.070 



.070 



.046 
1.563 

.781 

.062 

.828 

1.609 

1.609 

.046 



.828 

.046 
.046 

.046 



.781 



045 



1.328 ! .384 j .553 j 9.845 9.400 

Bth 11.84 (13.13 I 24.52 | 16.38 ! 17.32 



8.341 
10.87 



145 



.377 



14.391 
19.41 



.080 
.035 



045 



14.080 
24.86 



.145 


.092 




.507 


.206- 


- 


.783 


.052 


.169 


.841 


.155 


.130 


1.681 


.593 


.379 


2.841 


.531 


.414 


2.377 


.571 


.839 


1.536 


1.495 


1.734 


1.855 


1.601 


2.385 


.435 


1.919 


1.898 


.435 


1.558 


2.154 




1.243 


1.812 


.145 


.802 


, 1.601 


.145 


.267 


.785 


.145 


.187 


.337 




.393 


.027 




.357 


, .138 




.090 


.084 




.316 


i 




.251 


.130 




.226 


.126 




.090 


.027 




.080 


j 




.136 






.090 


.084 




.271 


i 




.266 


| 




.080 


i 



084 



15.336 
23.60 



Table 16. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of scup 
for all Massachusetts inshor.e strata sets , 
spring and autumn, 1976 - 1981. 



SPRING 





Mean 


95% Confidence 


Mean 


95% Confidence 






Wt./tow 
17.81 


Limits 


No. /tow 
50.48 


Limits 


Wt./No. 


1978 . 


* -46.30 


* - 123.22 


0.35 


1979 


9.63 


0.25-19.00 


40.65 


3.44- 77.86 


0.24 


1980 


22.95 


* -65.18 


104.74 


* - 284.58 


0.22 


1981 


9.48 


2.28-16.67 


159.41 


27.72- 291.10 


0.10 



AUTUMN 



1978 


14.26 


9.42-19.11 


1797.25 


1979 


11.38 


7.92-14.84 


1088.63 


1980 


12.08 


8.77-15.39 


1141.45 


1981 


13.51 


6.42-20.60 


911.16 



1026.82-2567.68 



746.06-1431.21 



792.69-1490.21 



258.59-1563.73 



0.01 

0.01 
0.01 
0.02 



* Negative lower limit. 



dLll XCU 



ifcau nu^J^er per tow (untransfcrmed) for scup 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



th 



M 



1 ll 

* i 



..055 

9.181 

125.891 

260.364 

147.142 

8.664 

1.612 

3.486 

11.185 

24.944 
15.633 
16.477 

6.721 
6.256 
3.437 
4.808 
.997 
.551 
1.131 

.109 



671 



1.629 
15.273 
42.052 

16.863 
2.681 
1.677 

10.445 

22.896 
20.304 
16.046 

5.547 
3.486 
1.372 
1.572 

.947 
.475 
.284 

.189 
.142 
.047 
.332 

.047 

.095 
.047 
.047 



.047 



.701 

1.594 
.064 
.191 
.191 

.128 
.446 
.128 

.383 



.064 



.064 



.064 



035 



1 --"• . 
















: 4 * 








># 








t? . 










648.644 


165.214 


4.017 


:h 


12.15 


15.28 


15.22 

! 



0.035 
19.00 



"7.951 

80.715 

700.177 

1828.783 

674.684 

50.139 

1.311 

.235 

3.179 
41.994 
38.614 
20.298 

8.563 

.603 
1.602 

3.969 

10.120 

1.589 

1.852 

.553 

1.118 

.294 

.517 

.247 
.125 
.625 

.372 
.250 

.232 

.093 



4.662 
104.647 

283.432 

394.187 

150.601 

9.469 

.095 

1.714 

8.080 

13.072 

10.212 

3.520 
1.332 
1.562 

3.841 
2.942 
1.564 
.999 
1.658 
2.320 
2.038 

1.278 

1.090 
1.467 
1.373 

1.087 
.851 
.520 
.473 
.095 

.284 

.095 
.095 



.093 



.093 



14.289 
81.350 i 
62.796 ; 
3.061 



14.224 

21.851 

2.731 

.038 



.141 
.064 
.064 

.077 



.064 



.052 

.155 
.090 
.128 

.052 
.155 



.052 



071 



3480.990 '1010.650 
7.33 ; 8.37 



161.976 
7.37 



39.525 
6.91 



Table 18. 



Stratified risen catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of black sea bass 
for all Massachusetts inshore strata sets , 
spring and autumn, 1S76 - 1981. 



SPRING 





Mean 


. 


Wt./tow 


1978 . 


0.37 


1979 


0.40 


1980 


0.43 


1981 


0.71 



95% Confidence 
Limits 



-0.77 



0.10-0.69 



0.13-0.73 



0.32-1.11 



Mean 
No. /tow 



1.12 



0.54 



0.54 



1.19 



95% Confidence 

Limits Wt./Nc, 

* - 2.82 0.33 

0.17- 0.91 0.74 

0.16- 0.93 0.79 

0.52- 1.86 0.60 



AUTUMN 



1978 


0.48 


0.18-0.78 


1979 


0.61 


0.32-0.91 


I960 


0.55 


0.214-0.85 


1981 


0.17 


0.08-0.26 



43.77 



40.71 



52.37 



34.86 



* -95.96 


0.01 


1.33-80.09 


0.02 


18.53-86.22 


0.01 


6.99-62.74 


0.005 



* Negative lower limit. 



!i 



ci.-it iy. 



strati'iec pean number :er tow (un transformed) for black sea bass 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



gth ; 





I 




i 






i 


- 




Tl) i 


i i 


2 1 


3 


4 5 


1 


2 


3 ' 


4 


5 


. 1 


! 


i 
i 


! ! 

< 1 


.180 : 


i 

i 


i 

i 






:• ; 


i 


i 


i 




6.781: 


i 

1 


i 






i 

i ! 


i 
1 


i 


| 




36.144 i 

1 


1.527 j 


i 






r 




i 

! 


l 


74.875 


3.910 ! 


.319 | 






/. 


: 


i 


I ' 


35.633 | 


2.610, 


.977 






i 


i 




; 


10.283; 


1.424 ! 


.531 ; 






1 


._.. • 1 




i 


1.140 ' 


0.284 j 


.264 ; 








; 1 


i 


. 


1.486 




.145 j 


.052 




'i c 


] 


i 


i 


i 


I 


.144 


.222 : 






n 


i 


J 










.048 


.072 


.045 




12 


i 




• 












i 




13 


1 

i 






. 










i 
• 




\A 


i 
















l 




15 


* 

i 
















i 




16 


! 

i i 


— i 

i 

i 














t 
i 




\7 


1 

; j 


i 

i 


i 


i 














IE 


; ! 


! 


i 












i 




1 c 




i 


















j. v 


.060 


i 
i 










i 




■ 




2. 


i 


i 

i 
i 














1 
1 




22 


.078 


! 

i 














! 

i 




22 


.132 


.142 j 














j 




2i 


| .297 


.142 


.143 
















4. v 


.513 


.332 


.141 
















- : 


; 


.475 


.072 












! 




«7 


.110 


.378 


.071 








.096 








. i 


.055 


.236 










.048 








• r 


.055 


.047 








.109 


.288 








1 1 


.055 


.047 








.046 


.384 




1 




1 . 


■ ■ 












.623 




1 
I 




jl' 


.109 












.240 




1 




'j - 


i 


.142 










.192 




1 




;•- 


.056 


.143 


.07? 


t 




.096 


.064 


» 




.' _ 


.110 


.047 














! 




-.. 


;; .060 


.331 










.048 




. 




-- 


\ 


.047 

j 










.048 




: 




: ; 




.048 

1 




i 

i 








i 








.048 




1 

i 


.062 




1 


. 




- . 


.111 


.047 






i 

r 




.048 


j 

i 


1 




-' 


j. .110 


.142 










i 
I 
i 




i 




~1 


i 


.048 










! 

i 
i 


• 


i 
i 




*; 


.056 


i .047 




i 




1 










! : .115 


S .142 




1 








i 




! • = 




1 .095 

t 






1 

I 








1 




4 - 


j; 


1 

.047 
.095 


1 






.062 


.048 




i 

■ 

i 
i 




! i i ! 


1 

i 


1 







able 19. (Cont. ) 



SPRING 



AUTUMN 



:o) — 



•I- 



8; 

* i: 



5' 



c . 



r 

5 '. 
t\. 

7 ' 






Bcj 



- I 



I 
) 



056 



Regions 



047 



048 



• 




1 








t 




1 






i 


r 










i 

! 


7 i: 
! 










■ 


1 


2. 


138 


3. 


363 


| 0.505 


ngth 


^n 


n r\ 


oo 


no 


! oc ci 



.048 



166.804 



12.152 

i 

l 1 f\ 1*1 



2.594 0.097 



r\ ^ *\ 



Table 20. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of tautog 
for all Massachusetts inshore strata sets, 
spring and autumn, 1976 - 1981. 



SPRING 



1978 
1979 
1980 
1981 



Mean 


95% Confidence 


Mean 


Wt./tow 


Limits 


No. /tow 


4.48 


0.88-8.09 


2.36 


5.16 


1.54-8.78 


2.89 


4.13 


1.25-7.01 


1.91 


2.86 


1.38-4.34 


2.16 



95% Confidence 

Limits Wt./NOi 

0.55-4.17 1.90 

1.02-4.77 1.78 

0.64-3.18 2.17 

1.00-3.31 1.33 



1976 


0.72 


1979 


0.57 


193 


1.05 


1961 


0.79 





AUTUMN 






0.05-1.39 


0.46 


0.06-0.87 


1.56 


0.19-0.95 


1.57 


* -3.24 


0.36 


0.24-1.86 


4.50 


- -9.95 


0.23 


0.12-1.47 


0.96 


0.36-1.56 


0.83 



" Negative lower limit. 



X . 



C' i. 



ainiej r. Lh.r. r.j:'.:er :-er tow (untvansioi rx-aj ror tautog 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



<L I 



047 



.047 ; 



1 


.110 ; 




, 


I 
i 




i 
i 




; 


.038 


i 


.110 ! 












i 


i 

J 2 


! .056 


! 
i • i 






.047 






13 


.110 


1 

* 
















u 


.056 ■ 


1 
! 




* 










.090 


] 


.446 i 


1 
1 














.038 


16 


.277 


".047 








.109 


.047 




.103 


17 


.225 










.093 


.047 




.179 ! 


It 


.227 


.047 








.155 


.095 






1 
l c ! 


.448 i 




, 






.047 




.052 


4 k 


; .055 


.047 j 

I 


i 






.093 


.047 






2 i 


.444 


! 










.142 






21 


.222 


i 










.142 




.090 




.166 


i 




.109 








24 


.220 


; ! 




.109 


.047 






— . c 


1 .165 


.048 ! 


i 
i 




.047 




.052 


li 


.227 


t 


I 


.046 


.048 




.052 




.110 


.048 j ! 


.046 


.047 






* c 




.047 j 












, k 


.056 


.047 ! 




.062 








2 - 


.164 










.062 


.047 






;.; 


.282 










.046 


.048 






- ^ 


i .221 










.155 






.079 


-. ■> 


.056 


.095 
















\i 


.167 


.047 






a> 


.109 




% 




- : 


| .278 


.047 










.047 






36 


! .170 


.047 




.052 




.062 








3 7 


i .165 


.048 








.062 








3t 


.277 


.096 










.047 






3S 


.277 










.062 


.047 






# - 


I! -055 


.191 


.077 






.264 








4) 


.556 










.093 


.047 






•42 


.056 


.190 








.248 








42 


i .166 


.189 




.038 




.062 








4^ 


.279 




1 

i 

l 














.167 


i .095 


| 














it 


.056 


.191 






.059 


.062 








_•"» 


.166 
.110 


.095 
.OPR 








.155 








gth 




1 

! 
1 


i 

! 
1 
t 
i 




■ 


1 

i 
1 







. >-'*-' JLC *-. 



\, cont . ) 



SPRING 



AUTUMN 



Regions 



ingth 
cm.) — 



Sj 



5 
6 

7 i 



i i' 



• li 



8r 






047 



.056 




.056 


.047 


.110 


.142 


.056 




.056 


.142 


.111 


.142 


.-056 . 


L .-095 


.056 


.047 




.190 




.095 


.055 


.048 



093 
062 
218 



.048 



8.008 , 2.754 j 0.077 | 0.090 ! 0.059 
rth 30.75 1 44.36 ! 40.00 38.98 46.00 



2.642 



1.231 



35.18 l 24.17 



045 



E 

2. 



0.817 
21.09 






! 



Table 22. 



Stratified nean catch per tow (kilograms and 
number), estimate of precision and average 
weight per individual of ocean pout 
for all Massachusetts inshore strata sets , 
spring and autumn, 1976 - 1981. 



•SPRING 



• 


Mean 


95% Confidence 


Mean 


95% Confidence 






Wt./tow 
21.10 


Limits 


No. /tow 
45.88 


Limits 


Wt./No. 


1976 . 


8.72-33.48 


25.01-66.74 


0.46 


1979 


22.82 


15.88-29.76 


44.80 


29.93-59.68 


0.51 


1980 


16.13 


10.43-21.84 


28.70 


17.87-39.54 


0.56 


1981 


35.04 


24.58-45.50 


62.43 


42.12-82.73 


0.56 



AUTUMN 



1976 


1.48 


0.88- 2.08 


18.66 


10.08-27.23 


0.08 


1979 


2.15 


1.35- 2.95 


25.05 


14. 97-35. 14 


0.09 


I960 


1.92 


0.64- 3.21 


13.94 


4.76-23.12 


0.14 


1961 


1.91 


0.77- 3.06 


6.67 


3.05-10.28 


0.29 



- Negative lower limit 



^- 



r lc *o. . :r = ;::it-o r.^ai. *.jz.l.ht per ;cv luij'.i^sicrned) for ocean pout 

length frequency intervals for regions 1-5, Massachusetts inshore 
bo t tor. trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



:h [ 


i i 






1 




1 


l : 2 1 3 1 M 


5 


1 


2 


3 ! 4 


5 


■ 

i 

- i 

r J 

1 
( \ 


i ! 

1 ! '■ \ 

ill! 

.118 j 




i 

1 

i 

1 


i 
i 
i 


i 

l 

1 
1 


i 

i 

1 




-r 


j .800 | 




• 

1 


1 




{ 
i 1 


i .279 

» • 




! 

1 | 


i 

i 




10 i 

i 

1 1 I 


i 


i 


i 


.040 




! 




■ 




1 

1 A 


i 




B 


.587 














1 "* 


i 




1 


.456 


.281 












1 w 

\ A 1 


i 

i 






•1.404 


.140 








.041 


.084 




1 • 
1 1 

J 




.316 


1.625 








.079 




1 6 


i ; - --' r -- 

1 ' i 


1.346 


1.274 










.084 


17 


: ' ! 

! I ' 

' i 1 


2.495 | 


1.754 








i 


.027 


l f 


1 .284 j I i 1-868 | 


.719 








i 




1< 


; - 24 ° . i 


3.732 


1.195 








i 


.027 


20 


| .131 


3.993 


.492 








i 
i 


.027 


21 


j .131 




3.347 


.351 








1 




22 


i 

.306 






3.033 


?328 








.307 


.084 


22 


.153 


i 
i 


1.175 


.772 








.267 


.616 


7c 


.568 | 


1.927 


1.404 








.226 


.448 


2i 


.306 


2.351 


1.053 








.207 


.475 


26 


.459 ' i 


3.959 


1.499 








.181 


.701 


2/ 


:• .612 ; 


3.134 


1.609 








.386 


.421 


I c 


.874 
.306 : 
1.639 ; 




3.023 
2.675 
2.568 


2.171 

.844 

1.990 








.125 
.045 
.125 


.674 

.169 

; .506 


, 


i .984 i 




3.411 


.890 








.316 


.532 


32 


i 

|l .896 1 




4.046 


.913 








.241 


.758 

■ 


33 


1' i 
!! .066 ! 




2.908 


.960 








.267 


.701 




.153 j 




3.104 


.690 








.532 


.804 




I, .361 




1.920 


.866 








.361 


i .674 


2t 


I! 

.984 




.043 


1.970 


1.277 








.316 


1.459 


37 


.678 






3.057 


.868 








.316 


1.180 


3c 


1.290 | 




2.933 


1.044 








.261 


j .843 


3s 


: : 1.224 ; 




2.457 


.850 








.316 


.532 


<C- 


!• .940 : 




3.280 


1.317 








.226 


.785 


41 


I! 1.546 






3.464 


.561 








.402 


.701 


<2 


; 1.290 


i 


i 


4.092 


.832 








.361 


.674 


4 3 
4^ 


j! .847 j 
j' 1.421 ! 




3.718 
1.726 


.990 
1.332 








.407 
.216 


.616 

1 .616 

1 - ~ 


^ : 


.454 1 


4.680 


.662 








.351 


.506 

j 


it 


i I 
i .896 j 


2.474 


1.219 








.271 


.390 


• -! 


! .809 i 


3.416 


2.084 








.316 


.927 


* ' 


! ' .656 


4.979 


2.402 








.136 


.506 


th 






i 
i 

i 


i 


i 
I 

1 










• 



Table 23. (Cont.) 



SPRING 



AUTUMN 



Regions 



0- 



3|j 

5 j 

i 



o , 



6: ., 



3i: 



E 
c 

7: 



8 



. i 



.874 
.852 
.984 
.787 
.721 
.219 
.284 
".328 
.219 

.175 
.219 
.066 

.066 



071 



.064 
.072 



.043 



.043 



.072 



4.994 
5.502 
4.880 
4.536 
4.456 
•3.904 
4.119 
3.613 
2.337 

3.359 
2.647 
5.477 
2.248 
1.952 
2.349 
1.887 
.859 
1.139 

1.041 

1.348 
.887 

1.001 
.402 
.573 
.476 

.556 
.964 

.241 

.515 
.421 

.082 
.463 

.477 
.354 
.041 



1.466 
4.280 
2.127 
2.851 
3.040 
1.673 
3.132 
2.098 
2.570 

1.533 

1.053 

2.410 

1.426 

.599 

.939 

.594 

.507 

.107 

.444 

.401 
.119 
.541 
.119 



JL_ 



.047 
.059 



th 



1 
i 


.271 

.121 
.156 




1 







.136 


.616 


.226 


.616 


.041 


.521 


.080 


.364 


.045 


.636 


.045 


.521 




.215 


.035 


.253 


.045 


.169 
.084 




.084 



045 ! 



.084 



Table 23. (Cont. ) 



SPRING 



AUTUMN 



Regions 



9. ' 



.if : 



lQc 



11 



i, 



9 i 

|L2c| : 

* i: 



;. 27.295 
th 39.68 



271 . 
079 



0.410 ,173.218 j 73.433 
62.80 i 42.93 ! 42.99 



8.301 
36.79 



Table 24. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of northern searobin 
for all Massachusetts inshore strata sets , 
spring and autumn, 197B - 1981. 



SPRING 



• 


Mean 


95% Confidence 


Mean 




Wt./tow 
14.74 


Limits 


No. /tow 


1978 . 


* -41.02 


75.95 


1979 


11.81 


1.40-22.21 


64.01 


1980 


12.53 


0.61-24.43 


55.37 


1981 


29.04 


1.57-56.50 


150.94 












95% Confidence 

Limits V. T t ./No, 

" * -214.10 0.19 



6.81-121.21 0.18 



2.82-107.92 0.23 



15.39-286.49 * 0.19 



AUTUMN 



1978 


3.81 


* - 9.12 


1979 


4.20 


* - 8.94 


1880 


0.97 


* - 1.43 


1981 


0.70 


0.07- 1.33 



21.56 



34.57 



19.35 



23.40 



2.24- 40.88 



12.94- 56.19 



10.99- 27.71 



* - .47.70 



0.18 

0.12 
0.05 
0.03 



Negative lower limit. 



table 25. 



Stratified mean number per tow (untransformed) for northern searobin 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



13 i 



:i is 



24 ii 



2: ,! 

I' 



•• r 



.109 
.388 

1.940 
2.634 
2.683 
1.361 
.351 
.224 
1.385 
5.188 
7.244 
7.416 
5.238 
4.963 
2.467 
2.294 
3.558 
1.613 
1.831 

.944 
.164 

.109 
.056 

.390 



9 
18 
69 
86 

69 
57 
32 
35 
61 
61 

65 
37 

17 

13 

3 
4 

1 



,048 

,286 
.476 
^862 
.767 
.096 
.346 
.401 
.377 
.129 
.927 
.562 
.250 
.860 
.974 
.617 

.043 
.348 

.333 
.798 

.201 
.418 
.145 
.142 
.048 

.142 



.205 

.913 

2.305 

2.949 

2.197 

.396 

.345 

.704 

2.301 

3.275 

2.884 

3.608 
1.498 
1.421 
1.184 
.788 
.543 

.589 
1.115 

.436 

.064 

.154 

.064 



l 



54.550 
21.90 



647.593 
25.26 



29.939 
20.90 



.035 
.041 



.041 
.038 
.035 

.038 
.070 
.038 
.076 



1.202 

1.447 

38.157 

36.621 

21.704 

5.402 

.175 

1.249 

.046 

.109 



.046 

.060 
.273 
.743 
.227 
.167 

.740 
.301 
.492 
.806 
1.300 
.936 

.557 
1.068 

1.038 

.775 

.279 
.155 
.093 



0.413 
27.78 



.048 
.143 
.144 
.479 
.096 
.096 



,289 | 

211 i 

,148 



.048 
.048 



086 

045 

082 
052 



.048 
.239 
.427 
.332 
.190 

.333 
.047 

.143 

.143 

.048 



.071 

.283 
.353 
.330 
.072 
.330 

.043 



• .064 



.082 
.166 

.166 
.045 

.045 



.046 

,027 
".084 



116.168 
8.69 



3.051 
21.22 



2.194 

19.78 



0.769 
21 .69 



0.157 
?f>. 1 Q 



Table 26. 



Stratified mean catch per tow (kilograms and 
number), estimate of precision and average 
weight per individual of longhorn sculpin 
for all Massachusetts inshore strata sets , 
spring and autumn, 1978 - 1981. 



SPRING 





Mean 


95 


% Confidence 


Mean 


95% Confidence 






Wt./tow 
2.30 




Limits 


No. /tow 
11.93 


Limits 


Wt./No. 


1978 . 




1.55-3.04 


7.86-15.99 


0.19 


1979 


2.63 




1.79-3.48 


17.91 


10.04-25.78 


0.15 


1980 


1.89 




1.43-2.35 


12.10 


8.64-15.56 


0.16 


1981 


6.08 




4.00-8.15 


38.67 


23.88-53.47 


0.16 



AUTUMN 



1978 


0.26 


0.12-0.41 


1979 


1.08 


0.61-1.54 


1980 


1.21 


- 0.49^1.92- 


1981 


0.70 


0.33-1.06 



4.09 



10.03 



14.49 



4.64 



1.43- 6.74 


0.06 


5.57-14.49 


0.11 


5.99-23.00 


0.08 


2.15- 7.13 


0.15 






: ' : Negative lower limit, 



/. r-ti c\ '. . itc ::.•_• v.. :.j::.Ler j er icw (ui;trar:s3 c: r.ed) for longhorn sculpin 
le:.£.Th frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 

SPRING . AUTUMN 



Regions 



i. • 



* \ 



■• I. 



i y 




13 


1 


14 


: 


M 


,060 


U 




-.7 


| 


; t 


■ 


:: 


.022 


1 i 


.213 


-.' 


.557 


fc ^ 


.989 


*, . 


1.295 


' « 


1.049 


: .- ' 


.57H 


;- 


.290 


- • 


.066 


'. ■ 


.186 


;. 


.180 


;■ 


.120 


: 1 


.082 


- 


.022 




.060 



048 



.048 

.047 
.144 

.048 

.095 
.239 
.096 
.048 



.048 



043 



072 



.136 
.328 
.810 
.679 

3.051 
3.578 

2.353 
1.924 
1.550 
1.405 
' .345 
.691 

.191 
.107 
.064 



5.765 
24.74 



0.861 
27.50 



17.328 
26.84 



.086 
.298 
.708 

.709 

.706 
-.632 

.622 

.849 

1.266 

2.599 

4.718 

6.065 

6.012 
4.587 
3.599 

2.859 

3.833 
3.790 

3.628 

3.619 
3.180 
2.566 
1.100 
.854 

.279 
.224 
.086 
.041 
.041 
.121 
.079 



041 



.070 

.140 

.539 

1.126 

.419 

.815 

.492 

.840 

1.870 

4.960 

5.973 

7.493 
9.483 

6.987 

4.456 
4.098 
3.562 
5.544 

7.915 
8.016 

6.220 

6.046 

3.689 

3.304 

.508 

.669 

.185 
,047 

.070 



59.797 
23.00 



95.538 
22.08 



043 





.111 


.152 


.084 


.122 


.111 


.361 




.244 




.070 


.084 


.035 


.299 




1.705 


.076 


3.532 


.271 


! 2.739 


.326 


1.957 


.191 


1.381 


.140 


1.645 


.146 


1.567 


.097 


1.381 


.115 


.908 


.035 


.634 


.035 


! .312 


.035 


.130 




.130 




.046 



0.043 2.452 



21.00 



21.11 



18.755 
23.47 



Table 28. Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of Yellowtail flounder 
for all Massachusetts inshore strata sets , 
spring and autumn, 157 & - 1981. 



SPRING 



Mean 
Wt./tow 



95% Confidence 
Limits 



Mean 
No. /tow 



95 c i Confidence 

Limits V?t./No, 



1978 



1979 



1980 



1981 



6.09 



6.90 



6.01 



9.81 



3.62 - 8.56 22.83 



4.93 - 8.86 26.42 



4.54 - 7.48 19.70 



7.34 - 12.27 46.52 



12.55 - 33.11 



18.87 - 33.96 



14.55 - 24.85 



31.12 - 61.93 



0.27 
0.26 
0.30 
0.21 



AUTUMN 



1978 


• 1.68 


197 9 


4.47 


1980 


3.55 


1981 


1.65 



0.91 - 2.46 9.95 



2.86 - 6.08 29.27 



2.42 - 4.67 24.75 



0.70 - 2.60 6.83 



6.72 - 13.17 



17.92 - 40.63 



16.66 - 32.83 



4.15 - 9.52 



0.17 

0.15 
0.14 
0.24 






• : Negative lower limit, 



arie <^. 



Miaiiliec mean i.j:;.Ler ier tow (untransformed) for Yellowtail flounder 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMK 



Regions 



gth 
u) 



9 ' 



12 ; 

i- r . ■ 
i, 

16 I 

•Hi 



047 



.060 



048 



.060 
.055 

.082 
.115 



.145 
.678 
.597 
.475 

.464 
.548 

1.095 
2.167 

1.401 
1.137 
1.679 

1.891 
1.836 
1.580 
2.422 
1.909 
2.854 
2.728 
3.325 
2.784 

3.632 
2.144 

2.343 
2.742 
1.121 

0.4*45 
1.055 

0.846 
1.204 
.268 
.440 
.474 
.426 
.064 
.072 
.145 

.290 



.041 



.497 
.038 
.229 
.599 
.599 
.446 

..336 
'.114 

.156 
.392 

.632 
1.360 
1.656 

3.281 
3.839 
4.972 
6.161 
5.964 
5.988 
5.701 
5.843 
4.584 

4.663 
4.221 

1.821 

1.529 

.811 

.857 
1.151 

1.140 
.707 
.471 

.659 
.484 
.144 

.383 
.170 

.041 

.045 
.086 



.094 
.283 
.683 
.755 
.542 

.223 
.493 

.705 
.518 

.961 

2.564 

. 3.672 

4.516 
7.120 
8.200 
10.335 
10.638 
8.367 
5.309 
3.565 
2.908 

1.398 
3.386 

2.004 
2.042 
1.923 

.2.005* 
2.351 

2.409 
2.758 
1.752 

1.397 

1.850 

.774 

.328 
.259 
.961 
.471 
.398 

.188 



igth 



.580 
.130 

.145 

.188 



.623 
.435 
1.058 
1.085 
1.346 
.812 
2.303 
1.866 
1.058 

.884 
.824 

.621 
.114 
.145 
.433 
.303 
.145 
.145 

.145 
.145 



.087 
.145 



.052 
.103 

.133 
.296 

.407 
.530 
.337 
.243 
.413 
.197 
.410 
.254 
.535 

.874 
.798 

.503 
.660 
.565 
.217 
.127 
.045 
.217 

.045 



045 
04 5 



I\ 



Table 29. (Cont. ) 



SPRING 



AUTUMN 



Regions 



gth 



m 



9!: 



] , 

2 

3 

H 

4 

i. 
b l 

6: : 

:!■ 



7' ! 



% ■■ 



8: 



i li 



t \: 



igth 



072 



168 



140 
,070 



094 



.043 



.046 



0.372 
28.90 



0.095 
16.02 



49.499 
25.68 



72.982 101.410 



25.61 



26.17 



15.808 
26.36 



8.051 
97 . ^F. 



12.19E 

*51 TO 



Table 30. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of winter flounder 
for all Massachusetts inshore .strata sets, 
spring and autumn, 1978 - 1981. 



SPRING 





Mean 


95% Confidence 


Mean 


95% Confidence 






Wt./tow 
18.70 


Limits 


No. /tow 
62.74 


Limits 


Wt./No. 


1978 


12.80-24.60 


47.50-77.97 


0.30 


1979 


16.56 


11.13-21.98 


58.85 


42.36-75.34 


0.28 


1980 


16.23 


11.93-20.54 


51.34 


41.47-61.21 


0.32 


1981 


21.50 


13. 51-29. 48 


70.86 


49.53-92.18 


0.30 









AUTUMN 






1978 


5.46 


3.47- 7.46 


25.47 


15.82-35.13 


0.21 


1979 


13.68 


9.13-18.22 


54.26 


36.95-71.58 


0.25 


1980 


6.92 


4.47- 9.37 


30.74 


20.84-40.64 


0.23 


1981 


6.36 


4.39- 8.33 


22.51 


15.37-29.66 


0.28 



* Negative lower limit 






t\ 



Ci L - • iCU 



w<_ *• 



« ur.iru:^iorn,eQ; ror w-Miter iiouniifci' 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 









SPRING 


• 








AUTUMN 






h 










Regions 












I 


i 


i 
i 








T 
j 






! 


1 


2 ! 


3 i 


4 ! 


5 


i 


2 


3 ! 


4 


5 


> 

- i 

! 

" i 

: 




i 

t 

i 

i 

i 

i 

! 
i 

i 
t 


• 

i 
• 
! 

! 


i 

1 
.086 




i 


j 




i 

i 

1 

I 

.103 




i 


- 1.15-9 


: 


1 


.121 










.103 






1.996 
1.875 


.382 




.802 
2.190 . 


.047 
.288 


i 




i 


.038 






1.121 


1.197 


.283 j 

1 


2.685 


.923 








' 




'. / 


2.307 


2.531 j 


i 
' i 


3.304 


1.999 


.062 




.064 






\ 2 


2.984 


2.582 




3.492 


2.548 












U 


1.743 


1.668 


1.561 


2.833 


2.564 


i 




.128 


.052 


.063 


15 


.717 


1.622 j 


1.526 


1.713 J 


2.801 


.022 






.359 


.385 


ir 


.821 


r.52i "i 


.551 


1.451 


2.971 


.046 






.535 


.920 


- 7 


' 1.258 


.902 


.924 


1.678 ! 


4.182 


.196 


.048 




.483 


1.414 


c 


1.341 


.999 


.205 


1.286 


4.272 


.104 






1.588 


1.690 


. ^ 


1.850 


.379 


.437 


1.197 


6.160 


.022 


.047 




2.848 


1.102 


-. - 


. 1.504 


.764 


.346 


3.484 


6.762 


.022 


.048 




3.368 


2.377 


2> 


j 1.621 


.665 | 


.486 


2.513 


5.025 


.112 


.048 




2.520 


2.836 


22 


1.647 


.427 • 


.339 


3.391 


5.001 


.153 






3.000 


3.778 


•> -. 


1.336 


.860 j 


1.334 


3.521 


5.110 


.066 






2.149 


4.088 




! 1.580 


1.049 


1.207 


4.000 


4.461 






.064 


2.267 


2.167 




2.183 


1.289 


1.025 


4.089 


3.328 


.270 






3.162 


2.616 


. , 


2.021 


1.194 


.561 


3.153 


3.869 


.227 






3.141 


2.313 


_ ^ 


2.695 


1.475 


.642 


2.942 


2.283 


.451 


.047 




4.224 


1 2.191 




2.749 


1.101 


1.549 


4.257 


3.044 


.180 


.095 


.211 


4.252 


1.668 


. . 


1.991 


1.386 


3.153 


3.176 


6.019 


.205 




.282 


3.754 


1.158 




2.564 


1.532 


2.588 


5.610 


7.709 


.093 




.339 


3.739 


2.193 




1.756 


1.570 


2.326 


3.622 


4.275 


.161 


.095 


.043 


2.020 


1.722 


, . 


1.825 


1.858 


1.177 


4.491 


7.930 


.208 




.185 


1.780 


i 2.323 




1.995 


1.477 


1.915 


3.939 


5.577 


.161 




.255 


1.365 


! 1.862 




1.449 


1.904 


2.535 


3.477 


2.546 


.139 


.096 


.11-4 


.853 


1.781 


\ 


1.774 


1.568 


1.064 


2.739 


3.766 


.139 






.461 


! .964 


., 


1.395 


1.998 


2.362 


3.087 


2.731 


.068 






.409 


1.085 


.__ 


J: 1.086 


1.857 


1.654 


1.798 


.815 


.022 




.043 


.399 


.660 


- ; 


1.545 


1.095 


.551 


1.238 


1.586 








.312 


.382 


-.. 


.670 


1.097 


.481 


.617 


.921 






.141 




.448 




.923 


.999 


1.173 


.525 


.510 






1 


.073 


.258 


• 583 


.618 


.770 


.238 










.141 


1 

i 


_.; 


.169 


.429 


.148 


.175 


.047 






.072 




.084 


„;. 


i; .115 


.380 


i 

i 


.175 


.402 






.043 


.038 




j .. 


.197 


.190 


i 


.172 


.178 








.038 


.210 


^ - 


.055 


j .096 


| .360 


i 
| 


i .259 




i 


.043 






«: 


.060 


j .048 


.461 


.041 










.052 


i 


-~ 


.022 


j .048 

. 047 


1 

9UQ 




i 










.084 


th 




i 


j 

i 


1 
l 

| 


i 

i 


i 

i 
i 

i 




| 

i 

! 

i 

i 





Table 31. (Gont.) 



SPRING 



AUTUMN 



Regions 



th 



5 



3 I! 



* I' 



t ,: 



8' 




060 I 
022 ! 



c 




! 


6. 


i 

1 


i 

2 


i 


t 
i 


3 


i 




^'; 




r it 




6 


1 

i 




/ 


i 

t 

» 




£ ;. 


1 
| 


V 


1 
I 


7c '' 


I 

1 
| 




1, 


i 
1 



047 



048 



.283 
.043 

.283. 



082 



.077 
.071 



igth 



56.773 ' 42.900 | 36.695 
24.16 26.17 ; 29.81 



89.390 112.912 
24.99 25.20 



043 



3.130 

26.69 



0.523 
26.36 



2.073 
30.95 



49.625 
25.75 



U4.320 
26.10 



Table 32. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of summer flounder 
for all Massachusetts inshore strata sets , 
spring and autumn, 1976 - 1981. 



SPRING 



1978 . 



1979 



1980 



1981 



Mean 


95% Confidence 


Mean 


95% Confidence 




Wt./tow 


Limits 


No. /tow 
1.17 


Limits 


Wt./No. 


1.20 


0.54-1.86 


0.32-2.03 


1.02 


0.61 


0.26-0.95 


0.37 


0.15-0.60 


1.63 


0.62 


0.36-0.88 


0.36 


0.22-0.50 


1.71 


1.04 


0.55-1.55 


1.19 


0.43-1.96 


0.87 



AUTUMN 



1978 


0.83 


0.51-1.16 


0.55 


0.33-0.78 


1.51 


1979 


0.26 


0.04-0.49 


0.17 


0.02-0.32 


1.58 


I860 


0.71 


0.40-1.02 


0.50 


0.25-0.75 


1.41 


1961 


0.63 


0.36-0.89 


0.77 


0.44-1.10 


0.81 



• : Negative lower limit. 



[Table 33. 



Stratified mean number per tow (untransformed) for summer flounder 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



2 



t I 



"I 

'* i- 

"I 

;: 



18 



1 C I 

' !! 

. I- 

--' •! 

21 

22 

I 



-- il 



i. 3 

:7 



" > ii 



4: 



tn 



.055 



.060 



.055 
.219 
.275 
.277 
.109 
.269 

.115 

.2H2 
.060 
.082 
.131 
.440 
.164 
.329 
.501 
.055 
.055 

.060 



.047 



.142 

.047 
.095 
.047 

.095 
.142 
.047 
.096 
.047 
.095 

.047 
.047 



.064 



.071 
.141 



.045 



048 



.205 



.046 : 



.022 

.093 

.046 
.191 
.306 
.259 
.311 
.422 
.379 
.177 
.046 

.060 
.084 
.218 
.044 
.022 



.047 

.047 
.096 

.047 

.048 
.047 



.077 



.077 



154 
154 



077 



045 



052 



Table 33. (Cont. ) 



SPRING 



AUTUMN 



jth- 



• li 



2 

3 I 

4 



II 

8 : 



Uk ' i, 
1 

2 
3 
4 

5 ! 
6 



• c ! 
l< 

70 9 



* |l 



3 i! 

i: 
*i! 

si: 






8o 



i 

2 
3 

4 

5!' 
6 

7 



1 

ngth 



Regions 



055 
056 



060 
055 



110 



.055 



.047 
.048 



.047 
.095 



.077 



.064 



.064 



.047 
.048 



.056 



.055 



.077 



047 



4.051 
37.91 



.022 
.084 
.062 



.047 



1.423 
42.47 



0.762 
47.35 



.022 



077 



.052 



064 



0.045 
31.00 



2.918 
40.56 



0.380 
42.12 



0.680 
44.12 



0.148 
50.95 



Table 34. 



Stratified mean catch per tow (kilograms and 
number), estimate of precision and average 
weight per individual of American plaice 
for all Massachusetts inshore strata sets , 
spring and autumn, 1978 - 1981. 



SPRING 





Mean 


95% Confidence 


Mean 


95% Confidence 






Wt./tow 

1.81 


Limits 


No. /tow 
20.39 


Limits 


Wt./No. 


1978 ; 


1.05-2.56 


6.77- 34.01 


0.09 


1979 


4.00 


3.44-4.56 


51.28 


39.04- 63.53 ' 


0.08 


1980 


5.17 


3.97-6.37 


88.33 


60.69-115.97 


0.06 


1981 


6.97 


4.74-9.20 


73.46 


40.62-106.29 


0.10 



AUTUMN 



1978 


2.96 


1.83-4.09 


59.79 


29.58-90.01 


0.05 


1979 


1.42 


0.70-2.14 


16.63 


9.02-24.24 


0.09 


1980 


2.91 


2.01-3.81 


36.95 


23.83-50.06 


0.08 


1981 


1.64 


0.59-2.69 


14.21 


4.78-23.64 


0.12 



- Negative lower limit. 






juaixi.cu ...caw uu..^ei' pti icw ^ U7it rar-s 1 or ned ; lor American plaice 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



? 

3 

4 

5 
t 

7 

e 

9 
)0 
11 
12 
13 
U 
15 
16 
17 
18 
19 
20 
21 
.22 
23 
.24 

25 

26 

27 

26 

29 

30 

31 

32 

33 

3< 

35 

36 

37 

38 

39 

40 

41 

« 2. 

43 

44 

45 

46 

47 



th 



072 
072 



.041 

.211 

.994 

1.110 

1.044 

1.331 

' .362 
1.775 

5.647 
7.279 
8.154 
7.575 
6.210 
3.159 
1.768 

1.699 

2.720 
1.325 
2.566 
2.771 

1.757 

2.329 
1.446 
1.787 



.436 
.753 
.251 
.346 
,201 

.242 
.246 

.070 

.111 



.070 
.115 
.041 



.280 

-910 

1.893 

2.185 

.420 

.700 

3.533 

11.880 

24.001 

30.734 

32.979 
24.747 
17.459 
20.401 
14.632 
15.596 
13.685 

8.564 
6.052 
6.381 
3.495 

5.242 

2.443 

2.466 

.892 



1.053 
.804 

1-600 
.712 
.941 

.821 
.829 

.734 

1.834 

.351 

.140 

.430 
.711 
.281 
.351 
.421 
.070 



.052 

.070 
.296 
.306 

.306 
.347 

.138 

.354 

.608 

.868 

1.484 

1.733 

2.148 

1.661 

1.195 

.908 

.549 

.389 
.338 

.301 
.572 
.363 
.261 
.336 
.045 
.175 
.080 



.107 

.612 

.585 

.896 

.497 
.444 

.728 
1.460 
3.061 
3.171 
930 
722 
515 

495 
580 
622 
1.424 

1.517 
.998 

.359 
.741 
.«*4U 
.279 
.191 
.297 
.053 
.053 
.107 
.053 
.080 
.053 
.107 

.027 



I 



idcie jd. {.(Jont . ) 



SPRING 



AUTUMN 



Regions 



0- 



2 
3 

A 
5 
6 
7 
8 
9 

6:. 

i 

2 
3 

5 
6 

7 

fc 

9 



5 

*| 

7 



S 
9 

8o 

1 

2 
3 

4 
i 
t 
7 
E. 



grth 



.832 
.046 

.291 
.070 
.046 
.046 



.070 



.070 



.145 
19.50 



67.942 
20.79 



265.126 
20.02 



084 



15.8.84 
23.55 



48.292 
22.95 



^mm 



Table 36. Stratified Dean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of witch flounder 
for all Massachusetts inshore- strata sets , 
spring and autumn, 1978 - 1981. 



SPRING 



Mean 
Wt./tow 



95% Confidence Mean 
Limits No. /tow 



95% Confidence 
Limits 



Wt./No. 



1978 
1979 
1980 
1981 



0.99 



0.64 



0.65 



1.46 



0.48-1.49 



0.15-1.12 



* -1.43 



* -3.23 



1.37 



0.62 



0.68 



1.71 



0.74-1.99 



0.19-1.05 



* -1.45 



* -3.50 



0.72 



1.03 



0.97 



0^85 



AUTUMN 



1976 


1.07 


0.35-1.80 


1.07 


0.46-1.67 


1.01 


1979 


0.50 


* -1.03 


0.63 


- -1.32 


0.79 


1980 


0.83 


0.12-1.54 


0.77 


0.14-1.40 


1.07 


1981 


0.11 


* -0.25 


0.16 


* -0.41 


0.65 



: ' : Negative lower limit 



JlJUlii icu ...ecu .;u,.^er pe: tow (uiitrar.slormed) for witch ilounder 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



i I. 



I 

i I 

"I 

1 I 
12 

13 

\A 

y '■ ' 

' L 

"i 

!7 ' 

i c ;. 
1 ; ; 

iC ! 

2! : 
I 

"i: 

22 ;i 

2* !: 
I! 



3; ■ 



f. i> 



.080 
.040 



035 



.080 

.120 
.080 
.240 
.080 

.240 
;t)40 



.070 
.140 



.045 



.090 






.045 



.086 

.045 
.122 



.211 

.632 
.070 
.421 
.321 

.391 

.351 

.351 

.110 
.281 



.027 

.027 
.027 

.027 



.027 
.027 

.027 
.027 
.027 

.027 
.111 



.027 

.080 
.053 



iav±e o/ . iuoni. ; 



SPRING 



AUTUMN 



Regions 



3 

i 
5 
t 
7 
b 
9 



6c 



j 
* 



r|| 

Bo : 






5 
6 

7 



thii 



072 



.090 

i 

i 
.045 
.045 
.086 

* .041 
.045 

.045 



.045 



070 

632 
,281 
,070 
,297 

,070 
.46.9 

.070 
.140 

.351 



.053 



070 



.027 



.084 



.053 



0.072 
53.00 



0.912 
48.17 



6.869 
43.06 



0.754 
42.25 



Table 38. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of windowpane 
for all Massachusetts inshore strata sets , 
spring and autumn, 1978 - 1982. 



SPRING 





Mean 


95% Confidence 


Mean 


95% Confidence 






Wt./tow 

9.08 


Limits 


No. /tow 
31.48 


Limits 


Wt./No. 


1976 . 


6.08-12.09 


21.12-41.85 


0.29 


1979 


8.46 


5.42-11.50 


30.12 


19.78-40.47 


0.28 


1980 


8.36 


4.91-11.81 


28.28 


16.78-39.77 


0.30 


1981 


11.12 


6.90-15.34 


36.83 


22.43-51.23 


0.30 











AUTUMN 


1978 


0.98 


0.53- 


1.42 




1979 


1.91 


1.19- 


2.63 




1980 


1.64 


1.02- 


2.27 




1981 


1.09 


0.51- 


1.68 





5.26 



8.49 



7.60 



7.78 



2.49- 8.03 


0.19 


5.59-11.39 


0.22 


4. 75-10. 44 


0.22 


2.67-12.89 


0.14 



Negative lower limit. 



.. 



M 



guxc js. biiaiiriea mean number per tew (untrans formed) for windowpane 

length frequency intervals for regions 1-5, Massachusetts inshcre 
bottom trawl survey, spring and autumn, 1981. 









SPRING 










AUTUMN 
















Regions 










h 


1 
















1 




i 


1 1 


2 


3 


4 


5 


1 


2 


3 


4 1 


5 














.093 










s! 












.046 




.064 






t \ 


.055 


.095 








.372 


.047 




i 

! 




7 . 


.109 


.047 


.638 






1.525 




.064 


• 

•1 




E 


v .220 


.096 


.638 






.713 










9 


i 






* 




.404 










1C 


• 










4.294 


' 








■ i 


.111 










1.968 






.052 


.050 


12 


.055 




.41.6 




.050 


1.625 










13 


.232 


.096 


.289 


.052 




1.718 




.077 


.052 


.109 


U 


.165 


.191 




• 


.224 


.844 


• 


.231 


.041 


.504 


15] 


.295 


.096 


1.940 


.090 


.165 


.109 




.308 


.041 


.315 


"u" 


.236 


.048 


.595 


."221 


.510 


.107 




.077 


.163 


.126 


17 


.317 


.096 


.679 


.169 


.413 


.128 


.047 


.077 


.045 


.189 


ie 


.181 


.047 


.701 


.200 


.094 


.107 




.372 






19 


.351 j 


.048 


.977 


.079 


.189 


.046 




.345 . 






20 


.270 


.142 


2.581 


.082 




.529 




.998 


.092 




2) 


1.602 


.143 


3.735 




.047 


.486 




1.183 




.046 


22 


.-440 


.142 


4.907 


.038 




.578 




1.405 


.041 




I 23 


.562 


.997 


4.936 


.172 


.119 


.399 




1.975 


.193 




2. 


.682 


1.331 


_ 5.980 


.399 


.218 


.227 


.047 


1.969 




.298 


55 


1.356 


1.908 


6.994 


.712 


.377 


.608 


.096 


2.395 


.090 


.483 


AW 

26 


1.689 


5.139 


7.086 


.668 


.409 


.425 


.048 


2.490 


.220 


.119 


27 


1.776 


7.580 


12.691 


.696 


.590 


.652 


.191 


2.047 


.038 


.298 


26 


j 1.725 


10.809 


10.197 


.576 


.546 


.260 


.240 


.845 


.124 


.099 


29 

"I ** 


1.075 ' 


9.955 


5.576 


.410 
.465 


.485 
.407 


.169 
.273 


.096 
.047 


.295 
.332 


.038 
.052 


.149 


1.057 


11.592 


6.761 


.059 


- • 


.565 


7.429 


3.749 


.221 


.228 


.060 


.190 


.349 


.079 


.050 


37 


.605 


7.966 


4.448 


.270 


.253 


.060 


.096 


.576 


.038 




33 


.319 


5.579 


2.550 


.207 


.149 


.046 


.142 


.231 




.159 


:>* 


.078 


3.623 


1.764 


.128 


.097 


.165 


.048 


.286 




• 


35 


.243 


3.157 


.859 


.090 


.099 


.060 










36 

37 


.165 


1.908 


.661 




.050 






.043 






i 


1.666 


.715 






.046 


.047 


.145 




I 

1 


36 


.022 


.238 


.539 






.107 








; .084 


39 




.096 












.064 




1 


40 




.431 


.077 
















41 




.048 


.212 




.047 












42 




.144 


















43 




.144 


.077 
















44 
















.145 






45 






















46 






















47 
























16.557 


J 83.028 


93.966 


5.943 


5.764 


19.239 


1.384 


19.387 


1.398 


i 3.13; 


th 


25.00 


29.84 


26.23 


26.12 


24.93 


14.57 


28.18 


24.67 


22.73 


i 22.05 



Table 40. 



Stratified mean catch per tow (kilograms and 
number), estimate of precision and average 
weight per individual of Atlantic herring 
for all Massachusetts inshore 'strata sets , 
spring and autumn, 1978 - 1981. 



SPRING 





Mean 


95% Confidence 


Mean 


95% Confidence 




.... • 


Wt./tow 
0.29 


Limits 


No. /tow 
34.56 


Limits 


Kt./No. 


» 

1978 * 


* -0.69 


* -91.11 


0.01 


1979 


0.67 


* -1.36 


17.35 


0.35-34.35 


0.04 


1980 


0.63 


0.06-1.21 


14.89 


* -32.17 


0.04 


1981 


0.37 


0.04-0.70_ 


5.66 


* -13.55. 


0.07 









AUTUMN 






1978 


0.41 


0.03-0.80 


8.51 


* -17.18 


0.05 


1979 


0.03 


* -0.07 


5.36 


* -15.29 


0.01 


1980 


0.10 


0.01-0.19 


1.49 


0.31- 2.67 


0.07 


1981 


0.09 


0.01-0.18 


1.09 


0.00- 2.18 


0.09 



" Negative lower limit. 



i (i- ^t_- 



Ml. Stratified mean number per tow (un trans forced) for Atlantic herring 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



1 -k 

hth 



Regions 



21 li 

22 1: .060 



*: !! 
43 1: 



i i- 0.060 

igth 22.00 



' 


.070 




.211 


.041 


.070 




.425 


i 


2.478 


.121 


9.702 




5.689 


i 

I 


.803 



.041 
.082 



.035 



.070 

.140 
.351 

.211 

.702 
.621 
1.058 
.930 
.880 
.490 

.340 

.370 
.080 
.040 
.080 



064 



046 



047 



.041 



.086 
.086 
.045 
.226 
1.536 
1.712 
.226 
.045 
.045 

.045 
.090 
.136 
.045 



1 0.321 | 25.812 0.046 0.047 

j 18.80 16.92 | 12.00 13.00 



0.064 
10.00 



4.364 
19.84 



.084 
.027 



0.111 
12.24 



Table 42. 



Stratified mean catch per tow (kilograms and 
number), estimate of precision and average 
weight per individual of butterfish 
for all Massachusetts inshore strata sets , 
spring and autumn, 1978 - 1981. 



SPRING 



• . • * * 


Mean 
Wt./tow 

0.16 


95 


% Confidence 
Limits 


Mean 
No. /tow 

1.14 


95% 


Confidence 
Limits 


Wt./No. 


1978 • 




ft 


-0.34 


#5 


- 2.34 


0.14 


1979 


0.02 




.ft 


-0.06 


0.28 


A 

9m 


- 0.67 


0.08 


1980 


0.38 






-0.87 


5.46 




- 11.02 


0.07 


1981 


0.11 




ft 


-0..28 


0.9S 


ft 


-__2.40 


0.11 



AUTUMN 



1978 


1.42 


0.95-1.89 


132.68 


85.97-179.40 


0.01 


1979 


0.89 


0.62-1.16 


74.55 


51.58- 97.51 


0.01 


1980 


4.61 


1.99-7.23 


418.75 


177.91-659.59 


0.01 


1981 


2.38 


1.53-3.22 


102.78 


66.14-139.14 


0.02 



• : Negative lower limit 



. '- A -C 



Mi'diiriea mean number per tew (untransfcrmed) for butterfish 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



-h 




1 i 2 


3 


U 


5 


1 


2 


3 


4 


5 


1 


\ 




i 






.048 








7 


1 








.093 


.096 


1.205 






i 

3 












.046 


.144 


12.552 






A 












.186 


.144 


22.960 


.296 


.415 


5 












. .730 


.284 


24.100 


.687 


1.117 


6 


.111 










4.907 


2.203 


6.833 


1.921 


2.961 


' 


.164 




.077 






13.437 


4.122 


9.670 


3.867 


.709 


. 


.115 










47.001 


25.212 


9.268 


3.243 




t 












56.326 


55.731 


2.829 


2.758 




,0 


_ 










27.888 


45.023 


1.228 


7.056 




,, 


.055 








.046 


5.941 


6.829 


1.206 


12.943 




12 


.290 










1.556 


3.915 


.478 


13.391 




13 








.041 




.655 


.095 


.043 


23.625 




14 


.060 










.139 






33.629 




15 
16 
17 


.022 

.361 

1.099 




* 


- 


— 


1^579 _ 


■ ' — 




9.792 
.361 

.206 




18 

20 

21 

i 22 


1.434 
.884 
.296 
.120 










.503 






.125 
.171 
.125 

.045 
.271 




1 23 






















.2* 






















25 






















26 






















27 






















28 


i 

i 




















29 


■ 




















30 


j 




















: 3i 


I 
1 




















32 


i 




















33 


i 

i 

i 




















- 


1 
J 




















35 


1 






















36 
























37 
























39 
.0 


i 

i 


i 
















l 




1 

41 






















17 


; 




















<3 


1 
| 




















<-: 


1 




















|C5 


i 




















«6 
























C7 

» C 






















ll 


5.011 
1 16.66 




0.077 
7.00 


0.041 
13.00 


.046 
11.00 


160.987 
8.81 


143.845 
^9 i l^ 


92.371 


114.512 


5.203 






■ 





















Table 44. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of sand lance 
for all Massachusetts inshore strata sets , 
spring and autumn, 1978 - 1981. 



SPRING 





Mean 


95% Confidence 


Mean 


95% 


Confidence 




* ♦ 

*- • 


Wt./tow 
2.80 


Limits 


No. /tow 
243.32 




Limits 


Wt./No. 


1978 ' 


* -6.05 




* -509.45 


0.01 


1979 


0.88 


* -2.14 


117.65 




* -274.21 


0.01 


1980 


1.90 


* -4.34 


202.88 




* -506.07 


0.01 


1981 


2.13 


_ 0.85-_3.42 


233.16 


107.40-358.93 


0.01 



1978 


0.10 


1979 


0.06 


1980 


0.03 


1981 


0.03 





AUTUMN 


-0.22 


26.35 


-0.16 


12.46 


-0.07 


4.83 


-0.07 


6.06 



Negative lower limit. 



- 64.77 


0.00 


~ 33.23 


0.00 


- 11.26 


0.01 


- 14.00 


0.00 



il j.e ■+:>. btratified njean nuir.ber per tow (untransfornied) for sand lance 

length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



Tth 



? 

3 

A 
5 
6 

7 

e 

9 
ID 
II 

12 

13 

14 

15 

16 

17 

16 

19 

20 

21 

22 

23 

.24 

25 
26 

27 
26 
29 
30 
31 
32 
33 
34 
35 
36 
37 
36 
39 
40 
41 
42 
43 
44 
45 
46 
47 
> r 



.278 



.056 
.167 
.111 



.056 
.056 



.056 



5th 



0.779 
9.65 



.048 

.190 

.095 

.473 

1.749 

2.649 

7.013 

9.472 

2.889 

1.899 

1.329 

.666 

.570 
.190 
.239 
.048 
.048 
.048 



.077 



.077 



3.479 

26.456 

126.567 

286.797 

324.998 
242.496. 
199". 936 
92.123 

52.383 

33.888 

7.188 

10.400 

3.772 

3.598 

.212 

.212 
.212 



1.701 
11.526 
14.227 
23.063 

24.125 

13.564 

4.624 

1.051 



.412 



29.613 
12.96 



.047 

.142 
.189 
.236 

:i42 
.047 

.047 



.334 
2.681 
6.274 
7.092 
2.779 

.192 

.192 



1.001 

1.500 

.499 

1.339 

2.540 

2.359 
.829 
.829 

1.339 

.191 
1.020 



038 



1414.870 
14.60 



94.293 
13.32 



0.850 
17.17 



19.543 
10.55 



13.447 
13.53 



0.038 
17.00 



Table 46. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of spiny dogfish 
for all Massachusetts inshore strata sets , 
spring and autumn, 1978 - 1981. 



SPRING 





Mean 
Wt./tow 

23.57 


95% Confidence 
Limits 


Mean 
No. /tow 

11.24 


95% Confidence 
Limits 


Wt./No. 


1976 ' 


* - 47.69 


* _ 


27.40 


2.10 


1979 


6.41 


3.38- 9.44 


1.85 


0.80- 


2.92 


3.45 


1980 


6.14 


2. 15-; 10.14 


1.70 


0.51- 


2.89 


3.62 


1981 


- 6.90 . 


_•- 0.59- 13.20 


1.55 


0.05- 


3.06 


4.44 



AUTUMN 



1978 


229.71 


48.56-410.85 


151.71 


28.29-275.12 


1.51 


1979 


40.17 


6.17- 74.17 


12.55 


3.49- 21.62 


3.20 


1980 


18.55 


* - 46.75 


4.96 


* - 12.49 


3.74 


1981 


46.37 


* -10^.17 


11.57 


* - 25.88 


4.01 



« Negative lower limit 



Table 47. 



Stratified mean number per tow (untransformed) for spiny dogfish 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



ngth 



9 

5o 
i 

2 
3 

4 

5 

6 

7 

B 

9 

60 

1 

2 

3 

4 

5 
6 

7 

B 

9 

7o 

1 

2 

3 

4 



6 

7 
E 
9 
80 
1 
2 
3 
A 
5 
6 
7 
- P. ■ 



L 

igth 



.055 



.290 
.130 



1. 


272 


1. 


996 


1. 


449 


0. 


304 


1, 


754 


0. 


304 


2. 


301 


1. 


272 





304 


1 


.272 





304 



1.029 
1.638 

4.190 



.027 
.027 

.046 



0.182 
0.046 
0.092 
0.153 
0.126 



.109 



.035 



.035 
.035 









!! 



Table 47. (Cont. ) 



SPRING 



AUTUMN 



Regions 



9 

9o 

1 

2 
3 

A 
5 

.«! 

7 
E 
V 

1Q: 

] 

2 

3 



Ll' ,; 



1 !: 



" I: 

I 

'■ || 
i 

:S 

j i 



6 

.7 

c 



Ith 



.055 
.060 
.056 
.170 
.284 

.060 
.115 
.164 
.055 

.115 

.142 

.175 
.115 

.055 
.115 



.055 



047 

142 

047 

190 
095 

047 
047 



047 



.333 
.404 
.201 

.652 
.130 
.290 

.591 
.528 
.333 

1.200 

.910 

.548 
.043 

.141 
.333 



.290 



^1-844 

§1:21 



100 



664 
21 



7.349 
96.09 



5.766 


.070 




3.822 


.105 


.063 


2.185 






2.489 


.070 




7.216 


.070 




8.549 


.035 


.046 


5.158 


.105 


.063 


5.882 


.035 




2.721 


.105 




3.822 


.035 




1.996 


.080 




2.301 


.070 





1.272 

1.754 
2.246 



0.725 



77.293 
90.94 



0.887 
93.62 



0.978 
79\ 53 



tl 



Table 48. Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of little skate 
for all Massachusetts inshore strata sets , 
spring and autumn, 1976 - 1981. 



SPRING 



• 


Mean 


95% Confidence 


Mean 


95% Confidence 




1978 ' 


Vt./tow 
14.10 


Limits 


No. /tow 
32.09 


Limits 


Wt./No. 


6.74-21.46 


9.48-54.71 


0.44 


1979 


18.22 


12.58-23.85 


38.11 


24.65-51.57 


0.48 


1980 


11.93 


7.88-i5.98 


25.83 


16.51-35.16 


0.46 


1981 


26.94 


19.63-34.26 


54.58 


38.78-70.37 


0.49 



AUTUMN 



1978 


6.43 


4.46- 8.41 


11.21 


7.75-14.67 


0.57 


1979 


15.28 


10.70-19.86 


28.87 


19.90-37.84 


0.53 


1980 


13.82 


8.96-18.67 


27.59 


16.06-39.11 


0.50 


1981 


7.31 


4.60-10.02 


13.28 


7.75-18.81 


0.55 



• c Negative lower limit, 



I 



i a i; j. e Ha. 



biratiriea niean number per tow (untransforroed) for little skate 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 









SPRING 










AUTUMN 
















Regions 










th 
) 


1 


2 1 


3 


4 


5 


1 


2 


3 


4 


5 


i 

2 

3 

6 
7 
8 
9 


i 


l 

j 


i 


T 
1 


• 


.781 










10 






















11 








.038 














12 








.076 














13 








.324 




.781 










14 








.156 














15 




.048 




.200 


— 


_ - ■ -- 










16 


.060 


.048 


.308 


.197 














17 






.308 


.273 














IE 


.240 






.076 


.109 








.038 


.050 


,9 


.169 






.197 










.052 




20 


.060 






.166 










.052 




21 


.109 


.047 


.154 


.224 












.063 


22 


.230 


.047 


.372 


.169 




.062 






.206 


.063 


23 


.388 




.449 


.378 


.168 


.107 






.052 




24 


.831 

1 




.422 


.479 


.050 


.062 




.071 




.063 


» 


1.345 


.048 


1.107 


.636 


.109 


.125 










26 


1.691 


.142 


.858 


.839 


.308 


.062 






.103 




27 


2.388 


.048 


1.282 


.944 


.109 


.060 


.048 


.064 


.052 


.084 


2* 


! 2.960 




.969 


1.009 


.218 








.141 




29 


1 3.178 

l 


.143 


1.817 


1.096 


.168 


.250 




.064 


.052 


.063 


30 


3.170 


.142 


1.447 


1.122 


.476 


.574 


.048 




.103 




31 


4.07*+ 


.239 


1.025 


.663 


.208 


.479 


.192 




.141 




32 


6.243 


.525 


-1.314 


.841 


.258 


.706 


.047 


.077 


.092 


.063 


33 


5.527 


.764 


.908 


.520 


.149 


.387 


.095 


.071 


.195 


• 


34 


j 5.283 


1.051 


.757 


.742 


.357 


.653 


.047 




.128 


.050 


35 


j 3.506 


1.149 


.974 


1.264 


.466 


.481 


.143 




.083 




36 


5.215 


1.003 


.781 


.363 


.159 


1.244 


.047 




.128 


.063 


37 


5.849 


1.005 


.942 


.500 


.317 


1.042 




.071 


.076 


.172 


36 


2.995 


.669 


.717 


.448 


.218 


.711 


.095 




.090 




39 


5.610 


.908 


.409 


.664 


.099 


1.353 


.143 




.247 




40 


4.424 


1.339 


1.351 


.835 


.407 


.973 


.143 




.182 


.059 


41 


6.791 


.812 


.473 


.870 


.178 


1.164 






.038 


.099 


. 42 


4.723 


1.960 


1.122 


.935 


.159 


1.787 


.096 


.217 


.114 


.208 


43 


5.127 


1.671 


1.184 


1.284 


.168 


2.940 


.048 


.225 


.182 


.113 


44 


1 9.172 


3.008 


1.850 


1.247 


.317 


3.596 


.048 


.426 


.103 


.149 


45 


i 14.731 

j 


4.099 


2.555 


.936 


.059 


5.742 


.190 


.497 


.114 




46 


16.340 


4.863 


2.964 


1.233 


.109 


8.105 


.477 


.607 


.052 




47 


12.369 


4.668 


3.450 


1.973 


.367 


7.124 


.192 


.998 


.052 




* t 


1 9.172 


4.244 


1 .630 


1.967 


| 


6.064 


.524 


.473 


. *345 


.ioq 


th 


! 

! 

i: 








^^^^^^^^^^^^^^^^^^ 






^^^^^^^^^^^^ 







Table 49. (Cont.) 



SPRING 



AUTUMN 



Regions 



KgtK 
2m} — 



JL 



9 

5o 
i 

2 
3 

A 
5 
6 
? 
8 
9 

6d 
i 

2 
3 

A 

C 

6 

7 
f 
9 

7o 

1 

2 
3 

A 

5 

6 
7 
b 
9 

80 

i 

2 
3 

A 
5 
6 
7 
& 



1 

ingth 



6.580 

2.H04 

.849 

.297 

.111 



2.764 

2.285 

.569 

.523 

.332 



.095 



2.043 
2.655 
.268 
.276 
.077 
.064 



2.528 
3.112 
2.168 
1.857 
1.438 
.546 

.234 
.159 
.038 



393 
317 
315 
268 
168 
225 

,272 
,094 



3.180 

1.862 

.109 

.187 

.171 



.142 
.096 
.095 
.048 



.125 



047 



J154.213 
I 40.38 



41.260 
43.90 



39.281 
39.02 



37.966 
40.61 



.295 
.269 
.359 



.071 



234 
280 
464 
487 
345 
234 



218 
113 
109 
050 
165 
113 

178 



046 
059 



7.810 
39.61 



53.054 
43.16 



3.004 
42.78 



4.854 
45.36 



5.256 
41.93 



2.520 
43.08 



Table 50. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of winter skate 
for all Massachusetts inshore strata sets , 
spring and autumn, 1978 - 1981. 









SPRING 






• 


Mean 


95% Confidence 


Mean 


95% Confidence 




• • 


Wt./tow 
12.92 


Limits 


No. /tow 
4.57 


Limits 


Wt./No. 


1978 * 


8.04-17.80 


2.57- 6.57 


2.83 


1979 


15.62 


9.07-22.18 


5.45 


3.21- 7.68 


2.87 


1980 


15.96 


10.95-20.96 


9.52 


5.58-13.47 


1.68 


_.1981 


44.30_.. 


32.61-55.99 


39.60 


28.40-50.80 


1.12 









AUTUMN 






1978 


7.86 


2.09-13.63 


3.96 


1.90- 6.01 


1.99 


1979 


10.60 


7.17-14.04, 


5.56 


3.77- 7.35 


1.91 


1980 


15.96 


6.53-24.42 1 


8.60 


5.50-11.71 


1.80 


1981 


11.90 


7.76-16.04 


7.60 


5.16-10.04 


1.57 



Negative lower limit. 



o ci a L -L. 



j,eu ni^ciii jiuiiiDer per tcv: ( unt r an s formed) for winter skate 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 











SPRING 










AUTUMN 
















Regions 






in 

r . 1 


1 


2 


3 


4 


5 


1 


2 


3 


4 


5 


i 

1 

2 

: 

7 
E 

1 9 


: 




j 


.• 














10 






















11 










. 












12 






















13 






.128 
















14 


. 




.128 
















15 








.. 


— — 


— 










16 










- 












17 






















16 


i 




















1 
19| 


i 




.128 
















20 


i 




.191 
















2' 


t 
i 




.064 
















22 






















23 


i 




.191 
















U 






.255 
















! 25 






.255 
















26 






1.615 










.141 








27 


| 




.786 


















it 






1.034 










.191 






; 29 


> 




1.839 










.128 






20 






2.921 






.046 




.332 






21 


i 




3.822 


.038 






.048 


.128 






3: 


i 

i 

• 


.048 


5.742 


.041 




.215 




.255 






3? 


.109 


.190 


8.519 


.038 




.123 




.255 






I 1 _ 
3-i 


.120 


.575 


6.743 


.076 


.168 


.289 


.142 


.191 






3; 


.262 


.621 


9.029 


.114 


.059 


.218 


.096 


.473 






36 


.505 


1.385 


4.270 


.552 


.099 


.385 


.048 


.959 






37 


.471 


.957 


9.451 


.424 


.159 


.525 


.143 


.490 






3f 


.460 


1.047 


6.453 


.514 


.050 


.368 


.048 


.416 






is 


.254 


1.002 


7.679 


.259 




.398 


.047 


.513 






- *- 


.278 


2.294 


11.054 


.719 


.159 


.681 


.095 


.963 






<i 


.154 


1.047 


6.666 


.308 




.139 


.095 


.768 






12 


.221 


1.340 


8.635 


.282 




.046 


.190 


.948 






• 3 


.318 


1.764 


7.707 


.090 


.059 


.169 


.238 


.902 






'.£ 


.377 


1.430 


7.070 


.325 




.246 


.239 


1.590 






■ Z 


.320 


.952 


9.529 


.041 




.246 


.190 


1.060 






6 


.553 


1.476 


7.495 


.269 




.262 


.047 


1.854 






7 


.578 


.760 


7.821 


.090 




.380 


.191 


1.583 








.188 


1.096 


5.473 


.279 


.094 


.373 




1.629 






1 
i 
















1 

1 

1 



Table 51. (Cont. ) 



SPRING 



AUTUMN 



. ngth 



Regions 



9 

5o 
i 

2 
3 

4 
5 

6 

7 
S 
9 

6o 
i 

2 
3 

4 

-5 
6 

7 

E 

9 

7o 

i 
? 

3 

i. 

5 
t 
7 
8 
9 

80 
i 

2 
3 
4 

5 

6 
7 
£_ 

gth 



.132 
.222 
.390 

.167 

.279 

.187 

.110 
.110 

.078 
.056 
.111 
.166 
.164 

.110 

.221 
.167 
.077 

.110 

.167 
.110 
.056 
.056 
.172 
.056 
.165 

.056 
.055 

.165 



.060 

.055 
.055 
.167 



.857 

1.620 

.473 

.618 
.427 
.473 
.381 
.474 

.429 
.286 
.522 
.712 
.238 

.379 
.378 

.237 
.142 
.095 

.189 

.284 
.095 
.236 
.047 
.189 
.095 
.095 

.285 

.095 
.284 
.047 
.239 
.096 
.095 
.095 

.191 
.047 

.047 



2.729 
5.570 
3.380 

2.763 
3.810 
3.159 
3.764 
1.426 

2.166 

2.205 
2.438 
2.115 
1.631 

1.067 
.755 

.672 
.775 
.863 

.308 

1.174 
.353 
.710 
.319 
.647 
.120 
.284 

1.282 

.807 
.136 
.211 
.794 
.782 

1.341 
.686 

1.^56 
.387 

1.646 
.695 
.492 
.716 



.134 
.406 
.200 

.156 

.355 

.213 

.350 
.155 

.103 

.052 



.052 
.052 



.047 
.047 

.047 

.059 

.096 

.144 
.249 

.107 
.059 
.047 

.119 



.059 

.050 
.050 



.294 
.153 
.171 
.155 
.373 
.125 

.046 
.046 

.356 

.107 
.218 
.373 

.187 

.187 

.062 

.060 
.218 
.107 

.060 
.171 
.046 

.093 



048 
142 
096 
048 

096 

096 
095 

048 



.109 



.062 

.109 

.046 

.046 

.109 
.046 
.046 



095 
096 



048 



1.266 
1.002 
.512 
.848 
.794 
.836 

.853 
".744 

.740 

.959 
.567 
.281 

.426 

.486 

.491 

.557 
.295 

.650 

.486 

.507 
.294 
.282 
.064 
.19H 
1.000 
.198 
.642 

.368 
.231 
.526 
.216 
.207 
.148 

.345 

.228 

.174 



052 



II 



Table 51. (Cont. ) 



SPRING 



AUTUMN 



Regions 



9c I 

1 

2 
.3 

'I 



I. 



t : 



1Q; 



• I- 



.1: 

I 



I; 



b 
6 
7 
E 

12c 

i 

.3 
i 

■5 
6 

.7 
c 



055 ; 



022 
056 
110 
055 

,055 



j 

.190 j 
.189 i 
.048 

.095 
.047 
.286 
.047 
.095 
.048 

.047 
.047 



.178 
.843 
.238 
.214 
.659 
.134 
.149 
.154 
.171 
.154 



.128 
.205 



052 



.043 



.059 



.046 



.151 

.087 
.064 
.222 
.294 

.151 

.087 
.433 



.217 
.145 



.059 



.063 



.071 



9.772 ! 30.611 
! 50.24 



l! 52.53 



1202.496 
46.13 



6.738 
44.86 



2.196 
53.28 



9.234 
49.50 



2.766 
46.11 



36.105 
55.26 



0.052 
52.00 



0.122 
92.54 



Table 52. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of longfin squid 
for all Massachusetts inshore strata sets , 
spring and autumn, 1976 - 1981. 



SPRING 





He an 


95% Confidence 


Mean 


95% Confidence 




-_ • 


Wt./xow 
0.66 


Limits 


No. /tow 
6.47 


Limit 


s 


Wt./No. 


1978 • 


0.25-1.08 


3.02- 


9.93 


0.10 


1979 


2.11 


1.06-3.16 


25.87 


10.62- 


41.12 


0.08 


1980 


2.72 


1.04-4.40 


20.73 


9.00- 


32.46 


0.13 


1981 


0.56 


0.19-0.93 


6.21 


2.94- 


9.48 


0.09 









AUTUMN 


1978 


4.18 


2.93-5.43 


560.33 


197 9 


2.66 


1.70-3.62 


362.34 


1980 


3.12 


2.26-3.97 


265.44 


1981 


3.68 


2.96-4.41 


284.80 



15.07-1105.60 0.01 



194.15- 530.53 0.01 



199.10- 331.78 0.01 



207.44- 362.15 0.01 



• : Negative lower limit. 



Table 53. 



Stratified i?ean nurber per tow (untrans formed) for Longfin squid 
length frequency intervals for regions i-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 19 81. 



al 
Le 

th - 






SPRING 










AUTUMN 










Regions 












■ 


; i 


, 




t 






r 


1 i 


2 


3 ' 4 ! 5 


3 


2 


3 


4 


5 






8.331 


1O.106 


.510 


.367 




- 


.167 i 


i 


.064 ' 


21.858 i 


56.617 I 


137.174 ' 


15.965 


9.496 


'. i 


2.727 


.096 


.728 ! 


72.850 


66.893 ■ 


56.916 i 


39.699 


12.602 




2.560 


.571 


2.641 . | 


65.617 


41.829 : 


34.476 : 


27.301 


14.222 




.836 


.475 - 


1.148 


36.915 


38.653 j 


28.643 ' 


26.589 


24.652 




.226 


.331 


.332 j 


41.941 

t 


29.669 • 


19.149 


14.775 


50.336 




.055 


.237 ; 


.128 


51.581 | 


3H.244 ' 


12.108 


20.539 


40.916 


c. 


.165 


.095 


.191 i ! 


32.112 ; 

i 


3H.407 


6.238 


19.847 


19.589 


r 


.221 


.285 


.128 


21.577 * 


20.207 


3.523 . 

i 


19.082 


9.881 


; 


.166 


.237 


.205 . j 


15.016 i 


12.243 


.587 ■ 


14.429 


2.824 


• - j 


.393 ; 


.095 


.077 i 




5.550 , 


8.045 ; 

i 


.886 , 


7.743 


1.755 




.778 : 


.333 


.255 j 




1.133 


3.138 


1.025 


5.888 




12 ' 


.331 ! 


.905 


.141 




4.302 


1.380 


.077 


2.373 




1 


i .388 | 


.475 


.295 




.712 


1.437 




.604 


i 


i 


.656 


.759 


.128 ! 




.125 


.379 




.357 


i 
I 


* i. ' 


. 387 


.709 


.409 j 




.046 " 


-."765" 


— — 


.849 




i c : 


< i 




1 ' 




.060 


.575 




.052 






.166 ! 


.567 


i 












1 
i 


I 
i 

: t : 


\ .in ; 


.614 


.231 ! 

t 




i 
i 


1.486 






1 


i r 


.111 ; 


.758 


l 






l 


.815 








t 

! 


.111 ; 


1.041 


.128 








1.199 








i 
21 


.111 


.426 


.141 






.046 


.719 






i 


22 


.111 


.426 


.064 | 








.527 






1 

i 


»i 


i 


.427 










.192 






i 


- - 


i .110 ; 


.425 


.064 








.096 








: -in 


.662 


.077 I 


















.236 


. .064 | 


.082 










:- 


.111 1 


.331 


i 1 


.022 










5: 


j 1 


.615 


















» 


.111 i 


.142 


.064 
















»•-■ 


i 


.332 


.141 
















>. 


i 

! , 


.047 


.077 
















22 


1 -in 1 


.189 


.077 
















3? 


! 1 


.236 


















3-£ 


.in : 


.142 


















^. 


. 


.047 


















36 


!; 


.142 
















• 


27 


! 


.095 
















! 


! r 


i 


.095 












• 




i 


.* 7 


■ 

:■ 
; 


.047 












1 




• 


i 


I: 


* 


i 


i 


i 
1 

i 
1 




< 








w 


i 




i i i 




i 

j 








* "7 


i 
li 


i 


! 

i i 1 




I 


t 

1 






a 


11.UU7 


13.642 


1 7.994 ! ! 

i 


379.877 


1365.623 


1301.311 


! 216.457 


186.273 


Bigth 


8.92 


18.58 


8.96 


i 


i 


5.47 


5.40 


• 3.44 


6.08 


6.00 



Table 54. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of American lobster 
for all Massachusetts inshore strata sets , 
spring and autumn, 1976 - 1981. 



SPRING 





Mean 


95% Confidence 


Mean 


95% Confidence 




• 


Wt./tow 
1.09 


Limits 


No. /tow 
3.17 


Limits 


Wt./No. 


■ 

1978 * 


0.59-1.59 


1.71- 4.63 


0.34 


1979 


0.82 


0.31-1.33 


2.34 


0.61- 4.07 


0.35 


1980 


1.16 


0.61-1.71 


3.56 


1.49- 5.63 


0.33 


1981 


2.77 


0.63-4.91 


.10.07 


1.40-18.73 


0.28 



AUTUMN 



1978 


2.46 


1.02-3.89 


10.01 


2.96-17.06 


0.25 


1979 


3.68 


0.88-6.48 


13.81 


2.20-25.41 


0.27 


1980 


1.56 


1.16-1.95 


4.97 


4.00- 5.95 


0.31 


1981 


1.82 


0.67-2.97 


1Ao 
7.12 


2.43-11.81 


C.7,'1 

0.26 



Negative lower limit. 



II 



JaJit JO. 



btratirien mean number per tow (untransformed) for American lobster 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



t 

7 

fc 

9 
10 
11 
12 
13 
14 
15 
16 
17 
IE 
19 
20 
21 
22 
22 
24 

25 

26 

27 
2E 
29 
30 
31 
32 
33 
3-S 
35 
36 
37 
38 

CI 

'.2 

13 
,4 
5 

6 

7 
t 



188 



,420 



172 

086 
086 

,086 



.041 



.104 
.050 



.104 



.052 



.086 



.104 
.209 
.104 

.104 
.313 



086 
107 



,058 

,349 

132 

,132 
539 



.022 



052 



174 
041 
103 

258 
329 



.059 



Table 55. (Cont.) 



SPRING 



AUTUMN 



Regions 





;th 


















j 






i) 


1 


2 


3 


4 


5 


] 


7 


• 3 


4 


5 




o 










.132 








i 
.041 






T 

5o 


.102 




1 


.209 




1 

i 


.391 


.126 




i 




.048 














.206 


.059 




2 




.086 




.104 


.560 








.402 






3 


.056 






.209 


.481 


.062 






.464 


.046 




4 


.210 


.257 




.204 


.765 








.545 


.298 




5 


.109 


.048 




.287 


.658 








.277 


.185 


6 


.092 


.086 




.313 


.132 








.659 




7 


.092 


.086 




.323 


.238 




.047 




.597 


.308 




6 


.300 


.086 




.259 


1.555 








.402 


.059 




9 


.184 


.048 




.128 


.395 


.062 






.597 


.649 




6o 


.280 


.134 




.354 


1.053 


.062 






.505 


.269 




i 


.102 


.048 




.079 


.370 




.048 




.339 






2 


.044 


.086 




.259 


1.160 






.064 


.689 


.399 




3 


.265 


.047 




.207 


.920 








.668 






« 


.152 






.224 


.798 








.855 


.473 






.086 




.253 


1.241 








.618 


.445 




d 


.092 








.977 








.762 


.374 




7 


.566 






.152 


1.160 








.487 


.518 




t 


.184 




.154 


.510 


2.319 






.064 


.857 


.651 




9 


i 






.156 


.238 






.064 


.402 


.554 




7r 


j .291 






.156 


.980 








.601 


.421 




. 


j .286 


• 




.050 


.765 








.344 


.185 




2 


.194 






.057 


.587 








.584 


.626 




3 


.184 








1.364 


.046 


.048 




.432 


.424 




^ 


.055 


• 




.-307 


.690 








.554 


.520 




5 






.085 


• .186 


1.221 








.384 


.105 


6 


.286 






.221 


.744 


.046 






.466 


.433 


7 








.399 


1.049 






.064 


.713 


.764 


6 


.184 


.086 




.378 


1.513 








.318 


.564 


9 


.044 






.189 


.395 








.352 


.370 


80 


.055 






.082 


.776 








.511 


.273 


i 


1 
1 






.041 


.107 








.236 


.109 


2 






• 


.050 


.559 






.064 


.277 


.126 


i 

3 


.102 








.339 








.193 


.546 


4 










.185 










.252 


5 


i 


.172 






.295 








.052 


.119 


6 








.041 










.103 


.189 




7 










.263 








.144 


.130 




c 






.077 


- 


.317 








.041 


i 




L 
igth 


1 

! 
i 

1 


















i 



I'l 






j able bb. (Cont. ) 



SPRING 



AUTUMN 



jigth 



9 

9o 

1 

2 
3 

A 

5 

.6 

7 

e 

.9 

lQo 

l 

.2 
3 

4 

6 

7 



lie I 1 



1 
J 
3 

5 

6 
7 
E 
9 

l 

2 
.3 

4 

■ 5 
6 
.7 

c 



:th 



Regions 



.086 



.064 
.077 
.071 

.085 
.071 



128 



079 


.309 


079 


.107 




.198 


169 


.237 


076 


.597 


041 


.281 


— 


.107 



085 



X 



.107 



077 



i 5.118 
163.67 



1.917 
59.23 



0.768 
87.79 



.082 

.045 
.045 



.185 


.211 


.142 


.407 




.084 




.059 


.133 


.126 


.052 





8.143 
63.95 



30.726 
68.77 



0.302 
61.57 



0.143 
63.70 



0.396 
77.12 



.052 
.041 



.126 



18.798 
66.54 



12.644 
72.18 



Table 56. 



Stratified mean catch per tow (kilograms and 
number) , estimate of precision and average 
weight per individual of rock crab 
for all Massachusetts inshore strata sets , 
spring and autumn, 1978 - 1981. 



SPRING 





Mean 


95% Confidence 


Mean 


95% Confidence 




". " - * T 


Wt./tow 
1.39 


Limits 


No. /tow 
22.16 


Limits 


Kt./Ko. 


* 

1978 ' 


0.51-2.27 


5.25-39.06 


0.06 


1979 


1.25 


0.70-1.80 


11.57 


6. 72-16. 41 


0.11 


1980 


0.78 


0.34-1.23 


6.21 


3.42- 9.00 


0.13 


1981 


_...2..10 


1.42-2.78 


18.74 


11. 60-25. "88 _ 


- 0.11 



AUTUMN 



1978 
1979 
1980 
1961 



3.36 
4.74 
4.14 
0.18 



2.35-4.37 



2.58-6.91 



3.17-5.11 



0.10-0.25 



43.74 



45.86 



55.60 



6.27 



22.68-64.81 


0.08 


22.92-68.79 


0.10 


28.67-82.53 


0.07 


* -13.59 


0.03 



Negative lower limit 



.. ic ~> / 



btratltied mean number per tow (untrar.sformed) for rock crab 
length frequency intervals for regions 1-5, Massachusetts inshore 
bottom trawl survey, spring and autumn, 1981. 



SPRING 



AUTUMN 



Regions 



j 

4 
«: 

6 

7 

6 

9 

10 

1 1 

12 

13 

14 

15 

16 

17 

IE 

J5 

20 

21 

22 

23 

24 

25 
26 

77 

29 

2'j 

31 

32 

33 

34 

35 

36 

37 

36 

39 

40 

41 

42 

43 

44 

45 

46 

47 



.060 

.826 

.707 

1.875 

6.011 

10.280 

7.219 

1.990 

1.254 

.680 

.273 



.048 

.575 

1.055 

1.917 

2.918 

1.766 

1.861 

.954 

.712 

.428 



.077 

.154 

.141 

.396 

1.033 

2.070 

3.595 

3.289 

2.445 

1.207 

.601 

.128 

.072 



th 



31.175 
7.11 



12.234 
6.60 



15.207 
8.54 



.038 

.229 

.811 

2.025 

3.545 

5.269 

5.635 

4.253 

2.107 

1.637 

.871 

.279 



26.740 
8.95 



.040 

.357 

1.018 

1.782 
1.329 
1.484 
1.265 
.248 
.047 



1.625 
8.117 

9.798 
.543 
1.251 
1.155 
.311 
.131 
.082 
.235 
.153 



527 



.372 
.372 
.576 

1.321 
.989 

1.200 
.444 
.272 
.188 
.217 



038 



309 
732 
662 
307 
079 
288 
052 

,079 



.449 
.311 
.139 



.084 



7.571 
9.99 



23.402 
3.02 



0.527 
3.00 



5.952 
6.94 



2.545 
8.15 



0.984 
8.03 



Table 58. Average bottom temperature (°C) by depth inter- 
val and region, Massachusetts inshore bottom 
trawl surveys, spring and autumn, 1981. 



SPRING 
Depth (m) 

Region < 9.3 9.4-18.3 18.4-27.4 27.5-36.6 36.7-54.9 >55.0 Mean Range 

1 12.4 11.0 10.4 7.4 10.9 6.9-14.2 



10.5 



10.4 



7.8 



8.8 



10.4 



7.6 



8.2 



7.6 



7.9 



6.5 



5.4 



6.4 



6.3 



5.3 



6.5 



6.6 



5.4 



5.8 



4.8 



10.5 5.5-13.5 



8.1 4.9-13.6 



6.9 5.0-10.6 



5.9 4.6- 9.1 



AUTUMN 
Depth (m) 

Region <9.3 9.4-18.3 18.4-27.4 27.5-36.6 36.7-54.9 >55.0 Mean Range 

1 19.2 18.4 16.8 16.6 18.1 13.5-22.5 



19.6 



16.2 



15.2 



19.1 



16.4 



13.7 



15.4 



13.5 



11.0 



12.9 



10.2 



11.9 



19.3 15.6-22.0 



14.6 9.9-18.0 



9.8 12.9 9.5-17.0 



13.4 



13.1 



12.2 



12.0 



11.8 



9.6 11.8 9.0-13.5 



I 



Job 2: Evaluation of winter flounder year-class success 



INTRODUCTION 

In order to effectively manage a- resource and its fishery, it is 
desirable to assess spawning success and recruitment. Developing a 
timeseries of young-of-the-year (YOY) indices of abundance (IOA) may 
provide such an assessment. 

Our methodology for collecting YOY abundance indices for winter 
flounder is based on knowledge of habitat and age-group behavior. Since 
YOY (0 age-group) are most abundant of fine-grained sediments in the 
estuarine littoral zone and move into the intertidal zone on a rising 
tide to feed (Tyler 1971), application of the following technique is 
considered appropriate. 

Efforts to evolve beach seining methodology began in 1972. The 
survey commenced in 1975 and has continued with only one major change in 
effort, as described below, through 1983. In this report we present 
1981 and 1982 seine IOA for winter flounder; however, no effort will be 
made to validate the seining technique. Validation will be detailed in 
the 1982 (Final) report. 



REVIEW 

In 1979, it was apparent that seine data, as then analyzed, did 
not reveal annual changes in year-class production because of broad con- 
fidence limits projected from standard deviations of seine indices. 
Alternative analysis techniques were investigated during 1980; post- 
stratification of the population's habitat in our study area (as used in 
stratified random sampling design) was ultimately undertaken to improve 
precision of the IOA. On the recommendation of reviewers of the 1980 
report, an additional statistical term was incorporated into the 
reanalysis of the 1975-80 data as well as the 1981 and 1982 data reported 
herein. 

In 1982, samples were allocated in proportion to the weight for 
each stratum, though actual selection of seine stations could not be 
truly random, due to restrictions of suitable bottom. In order to 
augment the number of stations in some estuaries, time and manpower con- 
straints dictated that sampling of Buzzards Bay estuaries , where catches 
had always been relatively low, be eliminated. 



8 



Another consideration influencing selection of additional sample 
sites was the annual bycatch of brit (YOY) Atlantic herring occurring in 
the south shore estuaries which unexpectedly provided insight on stock 
abundance (Howe et al. 1983). These catches (as percent occurrence in 
tows) seemed to favorably compare with NMFS year-class size evaluations. 
Some expanded sampling on the south shore was therefore warranted in the 
hope that the seining survey could provide another indicatior of herring 
recruitment, even if it ultimately failed to fulfill that expectation 
for winter flounder recruitment. 



METHODS 

Assessment of winter flounder year-class strength was undertaken 
in six estuaries on the southern shore of Cape Cod. Recur itment from 
these estuaries is to inshore and offshore fisheries south and east of 
Cape Cod (Howe and Coates 1975) and has been identified as a major Massa- 
chusetts stock unit area (Pierce and Howe 1977). 






Sampling techniques . The annual seine survey was . conducted from mid- 
June to mid- July, the time of greatest YOY availability in the intertidal 
zone. Seining was restricted to the top half of the incoming tide when 
YOY were well distributed throughout the zone (Tyler 1971). At each 
station, three replicate tows, from a depth of 1.0-1.3 m and perpendicular 
to shore, were made with a 6.5 mm nylon mesh, 6 m straight seine equipped 
with a weighted lead line footrope to minimize escapement. Area swept was 
estimated by multiplying seine spread (maintained at 5.5 m with a taut 
spreader rope) by seining distance (measured by pace). 

Sampling site selection was dictated by local conditions. Areas with 
substratum suitable for efficient seining (i.e., regions of < 0.5 m 
tidal amplitude and smooth intertidal bottom) were selected and sampled 
routinely each year. In most years, at least 99 seine hauls were made in 
southern Cape Cod estuaries. 

YOY index . A computer program (YOYSTAT), written by DMF personnel, was 
used to calculate stratified mean catch per tow. Each data record is a 
station consisting of seine haul data pooled to create an individual 
observation (i.e., y*.s = #Y0Y/nr). A series of stations make up a 
stratum with each estuary being a different stratum. The estuaries' 
littoral perimeter (n mi) served as a weighting factor rather than area, 
because it was considered by us to be as reliable a measure of habitat 
as an area measure, given the difficulty of calculating intertidal and 
subtidal area from nautical charts of inadequate definition. 



Formulae for the stratified mean, y , its variance, V(y ), and 95% 
confidence intervals (CL. , and CL 9 ) are: 



*st = N i=l Vi 



V( y s t ) = R 2 r ^^ <& T (1-N./N)S.2) 



n^ 



C V CL 2 " ^t " t .05[n-l] X V (y st ) 1/2 



where, 



k 

N 

n i 



= total # of strata 

= total weighting coefficient of all k strata 

= weighting coefficient of stratum i 

= # tows in stratum i 



ID 
2 



S i 



n 



l- 



y . = • £ . y . . /n . 
J i ]=i J i3 i 

y . . = individual observation j in stratum i 



= variance about stratified mean in stratum i 



An additional term (i.e., ~2 £ (l-N^/N^S^) was attached to the variance 
because, according to Cochran (1977), when employing post-stratification, 
samples were not taken in proportion to the weight of each stratum. This 
term alleviates that particular problem. 






RESULTS 

Estuarine means and standard deviations are presented in Table 1. 
The stratified mean density index for the southern stock unit, 1975-82, 
and 95% confidence limits are shown in Table 2 and Figure 1. The computer 
generated analysis of both post-stratified data (1975-81) and 1982 data, 
wherein the number of stations sampled was proportionately allocated by 
estuary, indicates changes in relative year-class strength are reliably 
detected. 



10 



REFERENCES 

Cochran, W.G. 1977. Sampling techniques (3rd Ed). J. Wiley and sons. 

Howe, A.B. , and P.G. Coates. 1975. Winter flounder movements, growth 
and mortality off Massachusetts. Trans. Amer. Fish. Soc. 
104:13-29. 



, T.P. Currier, and F.G. Germano, Jr. 1983. Occurrence of young- 
of-the-year Atlantic herring in southern Massachusetts estuaries 
an update. Coastal Oceanogr. Climatol. News. 5(3):3H-35. 



Pierce, D.E., and A.B. Howe. 1977. A further study on winter flounder 
group identification off Massachusetts. Trans. Amer. Fish. Soc. 
106:131-139. 

Tyler, A.V. 1971. Surges of winter flounder, Pseudopleuronectes 

americanus , into the intertidal zone. J. Fish. Res. Bd. Can. 
28:1727-1732. 



11 



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LO 

H 


CO 

Zt 
00 
CM 


o 

in 

rH 

CM 


o 

CD 
CO 


cn 
cn 

rH 

rH 


CD 
LO 
O 


LO 

zt 

CO 


cn 
o 

LO 


in 

zt 

CM 


Zt 
O0 


cn 

CO 
H 


LO 
O 
rH 



00 


oo 


in 


CO 


zt 


00 




CM 


o 


CT> 


in 


O 


00 


rH 


rH 


H 


rH 


CM 


rH 




rH 


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CO 


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CO 


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r> 


r> 


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rH 




in 


t> 


00 


CO 


CM 


Zt 


o 


LO 


Zt 


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LO 


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cn 


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CO 


cn 


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CO 


t> 


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in 


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cn 


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CO 


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rH 


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>> 


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(0 


> 


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a. 


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3C 




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P4 




■M 


O 


•H 


CO 




a> 


nJ 


P 


3 


•H 


CO 


bO 


<D 


o« 


•M 


5 


CO 


rd 


fc 


ftJ 


o 


ai 


id 


•M 


o 


3= 


o 


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PQ 


CO 













U 




>> 








O 


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rd 


>> 




b 


X) 


C 


PQ 


rd 


>> 


cu 


ti 


O 




pq 


rd 


> 


rd 


Pu 


•M 




PQ 


•H 


X 




•H 


■M 




OC 




V 


O 


•H 


CO 




a> 


rd 


3 


p 


•H 


CO 


bO 


<1) 


cr 


■p 


2 


CO 


rd 


U 


rd 


O 


CD 


rd 


+J 


CD 


& 


O 


►J 


CQ 


c/i 



Table 2. Stratified mean density indices (number of YOY winter 
flounder/m 2 ) and 95% confidence limits* 1975-1982. 



Stock Unit 



Year 



No. of 
Stations 



South coast 


of 


1975 


14 


Cape Cod 












1976 


37 






1977 


37 






1978 


35 






1979 


37 






1980 


36 






1981 


33 






1982 


48 



Stratified mean 
density index 
(No. YOY/m 2 ) 



0.31 
0.33 
0.62 
0.34 
0.49 
0.40 
0.33 
0.38 



95% C.L. 



0.293-0.327 
0.318-0.342 
0.602-0.638 
0.322-0.358 
0.473-0.507 
0.386-0.414 
0.315-0.345 
0. 359-0. 401 



II 



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ACME 
IWKBfNDING CO., fffCL 

■^CAMBRIDGE Srmt 




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